Deruvian (), also known by several other names including Damian, was a possibly legendary 2nd-century

bishop A bishop is an ordained member of the clergy who is entrusted with a position of Episcopal polity, authority and oversight in a religious institution. In Christianity, bishops are normally responsible for the governance and administration of di ...

and

saint In Christianity, Christian belief, a saint is a person who is recognized as having an exceptional degree of sanctification in Christianity, holiness, imitation of God, likeness, or closeness to God in Christianity, God. However, the use of the ...

, said to have been sent by the

pope The pope is the bishop of Rome and the Head of the Church#Catholic Church, visible head of the worldwide Catholic Church. He is also known as the supreme pontiff, Roman pontiff, or sovereign pontiff. From the 8th century until 1870, the po ...

to answer King Lucius's request for baptism and conversion to

Christianity Christianity is an Abrahamic monotheistic religion, which states that Jesus in Christianity, Jesus is the Son of God (Christianity), Son of God and Resurrection of Jesus, rose from the dead after his Crucifixion of Jesus, crucifixion, whose ...

. Together with his companion St Fagan, he was sometimes reckoned as the

apostle An apostle (), in its literal sense, is an emissary. The word is derived from Ancient Greek ἀπόστολος (''apóstolos''), literally "one who is sent off", itself derived from the verb ἀποστέλλειν (''apostéllein''), "to se ...

Britain Britain most often refers to: * Great Britain, a large island comprising the countries of England, Scotland and Wales * The United Kingdom of Great Britain and Northern Ireland, a sovereign state in Europe comprising Great Britain and the north-eas ...

. King Lucius's letter (in most accounts, to Pope Eleutherius) may represent earlier traditions but does not appear in surviving sources before the 6th century; the names of the bishops sent to him does not appear in sources older than the early 12th century, when their story was used to support the independence of the

bishops A bishop is an ordained member of the clergy who is entrusted with a position of Episcopal polity, authority and oversight in a religious institution. In Christianity, bishops are normally responsible for the governance and administration of di ...

St Davids St Davids or St David's (, , "David's house”) is a cathedral city in Pembrokeshire, Wales. It lies on the River Alun and is part of the community of St Davids and the Cathedral Close. It is the resting place of Saint David, Wales's pat ...

Wales Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic ...

and the antiquity of the

Glastonbury Abbey Glastonbury Abbey was a monastery in Glastonbury, Somerset, England. Its ruins, a grade I listed building and scheduled ancient monument, are open as a visitor attraction. The abbey was founded in the 8th century and enlarged in the 10th. It wa ...

in England. The story became widely known following its appearance in

Geoffrey Geoffrey, Geoffroy, Geoff, etc., may refer to: People * Geoffrey (given name), including a list of people with the name Geoffrey or Geoffroy * Geoffroy (surname), including a list of people with the name * Geoffroy (musician) (born 1987), Canadian ...

Monmouth Monmouth ( or ; ) is a market town and community (Wales), community in Monmouthshire, Wales, situated on where the River Monnow joins the River Wye, from the Wales–England border. The population in the 2011 census was 10,508, rising from 8 ...

's ''

History of the Kings of Britain (''The History of the Kings of Britain''), originally called (''On the Deeds of the Britons''), is a fictitious account of British history, written around 1136 by Geoffrey of Monmouth. It chronicles the lives of the kings of the Britons ove ...

''. This was influential for centuries and its account of SS Fagan and Deruvian was used during the

English Reformation The English Reformation began in 16th-century England when the Church of England broke away first from the authority of the pope and bishops Oath_of_Supremacy, over the King and then from some doctrines and practices of the Catholic Church ...

to support the claims of both the

Catholics The Catholic Church (), also known as the Roman Catholic Church, is the largest Christian church, with 1.27 to 1.41 billion baptized Catholics worldwide as of 2025. It is among the world's oldest and largest international institut ...

and

Protestants Protestantism is a branch of Christianity that emphasizes Justification (theology), justification of sinners Sola fide, through faith alone, the teaching that Salvation in Christianity, salvation comes by unmerited Grace in Christianity, divin ...

. Christianity was well-established in

Roman Britain Roman Britain was the territory that became the Roman province of ''Britannia'' after the Roman conquest of Britain, consisting of a large part of the island of Great Britain. The occupation lasted from AD 43 to AD 410. Julius Caes ...

by the third century. Some scholars therefore argue the stories preserve a more modest account of the conversion of a

Romano-British The Romano-British culture arose in Britain under the Roman Empire following the Roman conquest in AD 43 and the creation of the province of Britannia. It arose as a fusion of the imported Roman culture with that of the indigenous Britons, ...

chieftain A tribal chief, chieftain, or headman is a leader of a tribe, tribal society or chiefdom. Tribal societies There is no definition for "tribe". The concept of tribe is a broadly applied concept, based on tribal concepts of societies of weste ...

, possibly by Roman emissaries by these names. Probably mistakenly, Deruvian's story has been given to the obscure St Dyfan thought to have been the namesake of

Merthyr Dyfan Merthyr Dyfan or Dyfan is a northeastern suburb of Barry in the Vale of Glamorgan, in south Wales, formerly an independent medieval village. It is also an ecclesiastical parish and a formal electoral ward of the Vale of Glamorgan. It borders Col ...

and

Llanddyfnan Llanddyfnan is a village and community (Wales), community in Anglesey, Wales, located north east of Llangefni, north west of Menai Bridge and west of Beaumaris. Description The community includes the villages of Capel Coch, Ceint, Llanddyfn ...

. His

feast day The calendar of saints is the traditional Christian method of organizing a liturgical year by associating each day with one or more saints and referring to the day as the feast day or feast of said saint. The word "feast" in this context does n ...

does not appear in any medieval Welsh

calendar of the saints The calendar of saints is the traditional Christian method of organizing a liturgical year by associating each day with one or more saints and referring to the day as the feast day or feast of said saint. The word "feast" in this context does n ...

and is not presently observed by the

Anglican Anglicanism, also known as Episcopalianism in some countries, is a Western Christianity, Western Christian tradition which developed from the practices, liturgy, and identity of the Church of England following the English Reformation, in the ...

Catholic The Catholic Church (), also known as the Roman Catholic Church, is the List of Christian denominations by number of members, largest Christian church, with 1.27 to 1.41 billion baptized Catholics Catholic Church by country, worldwid ...

, or

Orthodox Orthodox, Orthodoxy, or Orthodoxism may refer to: Religion * Orthodoxy, adherence to accepted norms, more specifically adherence to creeds, especially within Christianity and Judaism, but also less commonly in non-Abrahamic religions like Neo-pag ...

churches in Wales.

Name

Deruvian's name is also cited as "Duvian" (''Duvianus'') or "Dwywan" and, owing to

scribal error A typographical error (often shortened to typo), also called a misprint, is a mistake (such as a spelling or transposition error) made in the typing of printed or electronic material. Historically, this referred to mistakes in manual typesetting ...

, also appears in modern saints' lists as "Damian" (''Damianus'').

Bishop Ussher James Ussher (or Usher; 4 January 1581 – 21 March 1656) was the Church of Ireland Archbishop of Armagh and Primate of All Ireland between 1625 and 1656. He was a prolific Irish scholar and church leader, who today is most famous for his ...

lists numerous other variants and misspellings,Jacobus Usserius

ames Ussher AMES, short Air Ministry Experimental Station, was the name given to the British Air Ministry's radar development team at Bawdsey Manor (afterwards RAF Bawdsey) in the immediate pre-World War II era. The team was forced to move on three occasions ...

''Britannicarum Ecclesiarum Antiquitates, Quibus Inserta Est Pestiferæ Adversus Dei Gratiam a Pelagio Britanno in Ecclesiam Inductæ Hæreseos Historia'' 'Antiquities of the Britannic Churches, into Which Is Inserted a History of the Pestilent Heretics Introduced against the Grace of God by Pelagius the Briton into the Church'' Ch. IV. (Dublin), 1639. Reprinted i
''The Whole Works of the Most Rev. James Ussher, D. D. Lord Archbishop of Armagh and Primate of All Ireland'', Vol. V, pp. 74 f.
Hodges, Smith, & Co. (Dublin), 1864. although Deruvian's identification with St Dyfan, the presumed namesake of

, seems to have been introduced by the widely discredited antiquarian

Iolo Morganwg Edward Williams, better known by his bardic name Iolo Morganwg (; 10March 174718December 1826), was a Welsh antiquarian, poet and collector.Jones, Mary (2004)"Edward Williams/Iolo Morganwg/Iolo Morgannwg" From ''Jones' Celtic Encyclopedia''. R ...

and is generally disregarded.Bartrum, Peter C
"Duvianus (1)", in ''A Welsh Classical Dictionary: People in History and Legend up to about A. D. 1000'', p. 236.
National Library of Wales, 1993. Emended 2009.

Sources

The legendary accounts of

King King is a royal title given to a male monarch. A king is an Absolute monarchy, absolute monarch if he holds unrestricted Government, governmental power or exercises full sovereignty over a nation. Conversely, he is a Constitutional monarchy, ...

Lucius Lucius is a masculine given name derived from Lucius (Latin ; ), abbreviated L., one of the small group of common Latin forenames () found in the culture of ancient Rome. Lucius probably derives from Latin word ( gen. ), meaning "light" (<

's baptism during the late-2nd-century

pontificate The pontificate is the form of government used in Vatican City. The word came to English from French and simply means ''papacy'', or "to perform the functions of the Pope or other high official in the Church". Since there is only one bishop of Ro ...

of Eleutherius are documented at least as far back as the "Felician Catalog", an early 6th-century edition of '' The Book of Popes'' which added more details to the terser entries of earlier

recension Recension is the practice of editing or revising a text based on critical analysis. When referring to manuscripts, this may be a revision by another author. The term is derived from the Latin ("review, analysis"). In textual criticism (as is the ...

s. In the 8th century,

Bede Bede (; ; 672/326 May 735), also known as Saint Bede, Bede of Jarrow, the Venerable Bede, and Bede the Venerable (), was an English monk, author and scholar. He was one of the most known writers during the Early Middle Ages, and his most f ...

mentioned that Lucius's "pious request" of baptism had been granted; the 9th-century ''

History of the Britons ''The History of the Britons'' () is a purported history of early Britain written around 828 that survives in numerous recensions from after the 11th century. The ''Historia Brittonum'' is commonly attributed to Nennius, as some recensions have ...

'' connected with

Nennius Nennius – or Nemnius or Nemnivus – was a Welsh monk of the 9th century. He has traditionally been attributed with the authorship of the ''Historia Brittonum'', based on the prologue affixed to that work. This attribution is widely considered ...

further states that Lucius had been baptized together "with all the chiefs of the British people" and "in consequence of a legation sent by the Roman emperors and

pope Evaristus Pope Evaristus ( Greek: Ευάριστος) was the bishop of Rome from 99/100 to his death in 107/108. He was also known as Aristus and is venerated as a saint in the Eastern Orthodox Church, the Catholic Church, and Oriental Orthodoxy. It is ...

". The 'third edition' of '' The Deeds of the Kings of the English'' composed by

William of Malmesbury William of Malmesbury (; ) was the foremost English historian of the 12th century. He has been ranked among the most talented English historians since Bede. Modern historian C. Warren Hollister described him as "a gifted historical scholar and a ...

around 1140 baldly states that "the rust of antiquity may have obliterated their names".Gulielmus Malmesburiensis illiam of Malmesbury ''Gesta Regum Anglorum''. .

. Translated by

J.A. Giles John Allen Giles (1808–1884) was an English historian. He was primarily known as a scholar of Anglo-Saxon language and history. He revised Stevens' translation of the ''Anglo-Saxon Chronicle'' and Bede's ''Ecclesiastical History of the English ...

a
''William of Malmesbury's Chronicle of the Kings of England from the Earliest Period to the Reign of King Stephen'', p. 21.
Henry G. Bohn (London), 1847. The monks' names seem to have first appeared in William's own chronicle of the abbey at Glastonbury, initially composed sometime between 1129 and 1139.Gulielmus Malmesburiensis illiam of Malmesburybr>''De Antiquitate Glastoniensis Ecclesiæ''.
1129–1139. Hosted at the University of Zurich's ''Corpus Corporum''. Robinson, Joseph Armitage. "William of Malmesbury 'On the Antiquity of Glastonbury'" in '' Somerset Historical Essays''. Oxford University Press (London), 1921. Hosted at

Wikisource Wikisource is an online wiki-based digital library of free-content source text, textual sources operated by the Wikimedia Foundation. Wikisource is the name of the project as a whole; it is also the name for each instance of that project, one f ...

.Newell, William Wells
"William of Malmesbury on the Antiquity of Glastonbury, with Especial Reference to the Equation of Glastonbury and Avalon" in ''Publications of the Modern Language Association of America'', Vol. XVIII, No. 4.
1903. This was soon followed by '' The History of the Kings of Britain'', the

pseudohistorical Pseudohistory is a form of pseudoscholarship that attempts to distort or misrepresent the historical record, often by employing methods resembling those used in scholarly historical research. The related term cryptohistory is applied to pseudoh ...

work completed by

Geoffrey of Monmouth Geoffrey of Monmouth (; ; ) was a Catholic cleric from Monmouth, Wales, and one of the major figures in the development of British historiography and the popularity of tales of King Arthur. He is best known for his chronicle '' The History of ...

around 1136, which included many more details.Galfredus Monemutensis eoffrey of Monmouthbr>''Historia Regnum Britanniae'' [''History of the Kings of Britain''], Vol. IV, Ch. xix.
.

. Translated by J.A. Giles & al. as ''Geoffrey of Monmouth's British History'', Vol. IV, Ch. XIX, in ''Six Old English Chronicles of Which Two Are Now First Translated from the Monkish Latin Originals: Ethelwerd's Chronicle, Asser's Life of Alfred, Geoffrey of Monmouth's British History, Gildas, Nennius, and Richard of Cirencester''. Henry G. Bohn (London), 1848. Hosted at

. Geoffrey claimed his additions derived from a treatise by

Gildas Gildas (English pronunciation: , Breton language, Breton: ''Gweltaz''; ) — also known as Gildas Badonicus, Gildas fab Caw (in Middle Welsh texts and antiquarian works) and ''Gildas Sapiens'' (Gildas the Wise) — was a 6th-century Britons (h ...

Aurelius Ambrosius Ambrosius Aurelianus (; Anglicised as Ambrose Aurelian and called Aurelius Ambrosius in the ''Historia Regum Britanniae'' and elsewhere) was a war leader of the Romano-British who won an important battle against the Anglo-Saxons in the 5th c ...

but this work (if it ever existed) has been lost. Around 1203,

Gerald of Wales Gerald of Wales (; ; ; ) was a Cambro-Norman priest and historian. As a royal clerk to the king and two archbishops, he travelled widely and wrote extensively. He studied and taught in France and visited Rome several times, meeting the Pope. He ...

's composed his work '' On Invectives'', which claims to preserve verbatim a letter to Pope Honorius II from the convent of

St David's St Davids or St David's (, , "Saint David, David's Welsh toponymy, house”) is a St David's Cathedral, cathedral City status in the United Kingdom, city in Pembrokeshire, Wales. It lies on the River Alun, Pembrokeshire, River Alun and is ...

.Giraldus Cambriensis erald of Walesbr>''De Inuectionibus'' [On Invectives], Vol. II, Ch. X, in ''Y Cymmrodor: The Magazine of the Honourable Society of Cymmrodorion'', Vol. XXX, pp. 143–6.
George Simpson & Co. (Devizes), 1920. The letter seems to date from the 1120s. The story was subsequently repeated and embellished elsewhere. These accounts generally provided no earlier authorities for their claims, however, prior to the collection of the

Iolo Manuscripts Edward Williams, better known by his bardic name Iolo Morganwg (; 10March 174718December 1826), was a Welsh antiquarian, poet and collector.Jones, Mary (2004)"Edward Williams/Iolo Morganwg/Iolo Morgannwg" From ''Jones' Celtic Encyclopedia''. R ...

by Edward Williams. Among other changes, Williams identified William's Deruvian as the St Dyfan who seems to have been an early

martyr A martyr (, ''mártys'', 'witness' Word stem, stem , ''martyr-'') is someone who suffers persecution and death for advocating, renouncing, or refusing to renounce or advocate, a religious belief or other cause as demanded by an external party. In ...

in southeastern Wales. Williams's alteration and apparent

forging Forging is a manufacturing process involving the shaping of metal using localized compression (physics), compressive forces. The blows are delivered with a hammer (often a power hammer) or a die (manufacturing), die. Forging is often classif ...

of other works means his accounts and claims are usually disbelieved. Further, the discrepancy in William of Malmesbury's two accounts of Lucius mentioned above has prompted scholars such as

Robinson Robinson may refer to: People and names * Robinson (name) Fictional characters * Robinson Crusoe, the main character, and title of a novel by Daniel Defoe, published in 1719 Geography * Robinson projection, a map projection used since the 19 ...

to believe that the missionaries' appearance in the Glastonbury chronicles were not part of the original work; instead, they account it a pious fraud perpetuated as part of

Glastonbury Glastonbury ( , ) is a town and civil parish in Somerset, England, situated at a dry point on the low-lying Somerset Levels, south of Bristol. The town had a population of 8,932 in the 2011 census. Glastonbury is less than across the River ...

's medieval feud with

Westminster Westminster is the main settlement of the City of Westminster in Central London, Central London, England. It extends from the River Thames to Oxford Street and has many famous landmarks, including the Palace of Westminster, Buckingham Palace, ...

over the order of their foundation.

Legend

According to the 12th-century historian,

, "Deruvian" was sent to Wales as a companion of the missionary " Phagan" in the mid-2nd century by

Pope Eleutherius Pope Eleutherius (; died 24 May 189), also known as Eleutherus (), was the bishop of Rome from c. 174 until his death in 189. His pontificate is alternatively dated to 171–185 or 177–193. He is venerated as a saint in the Catholic Church. H ...

.Mullins, Daniel J.. ''Early Welsh Saints''. Carreg-Gwalch Press, 2003, p. 30. Shortly after,

'' also described "Duvian" as the companion of " Fagan", providing many additional but suspect details.

Life

Baring-Gould, Rees and Mullins are widely dismissive of the legends surrounding Lucius but offer that Deruvian and his companion may have been genuine local saints whose names were preserved in the area around

Llandaff Llandaff (; ; from 'church' and ''River Taff, Taf'') is a district, Community (Wales), community and coterminous electoral ward in the north of Cardiff, capital of Wales. It was incorporated into the city in 1922. It is the seat of the Bisho ...

and then—as else nothing remained known of them—were mixed up with the separate stories surrounding Lucius Rees, Rice
''An Essay on the Welsh Saints or the Primitive Christians Usually Considered to Have Been the Founders of Churches in Wales'', pp. 82 ff.
Longman, Rees, Orme, Brown, Green, & Longman (London), 1836. Bartrum, however, notes the lack of earlier sources and posits that one must suppose such dedications followed the popularization of Geoffrey's story.Bartrum (2009)
"Ffagan", p. 298.
/ref>

Legacy

Following the

, St Deruvian is now often conflated with the supposed St Dyfan presumably martyred at

, although Baring-Gould notes that his name in the earliest known sources could never have been understood or developed as Dyfan at any time. The church at Merthyr Dyfan seems to have been dedicated to St Teilo since its foundation, but is now dedicated jointly to SS Dyfan and Teilo. As late as 2010, the local parish continued to claim to be the oldest Christian settlement in Wales on the basis of the legends about King Lucius. There is a church at Llandyfan ("St Dyfan's") outside

Ammanford Ammanford ( ) is a town and community (Wales), community in Carmarthenshire, Wales. At the 2021 United Kingdom census, 2021 census the community had a population of 5,445, and the wider built up area had a population of 8,285. Ammanford is se ...

in Wales, although there is no large community there. It was notable for its importance in the early Welsh Nonconformist movement.Norman, Terry
"Llandyfan Church"
Accessed 3 February 2015. Roberts notes the similarity with

Dyfnan Saint Dyfnan ap Brychan was an obscure Welsh saint. He was sometimes accounted a son of Brychan, the invading Irish king of Brycheiniog. Legacy Llanddyfnan ("St Dyfnan's") was dedicated to him on Anglesey and claimed his relic In religion ...

, son of the invading Irishman

Brychan Brychan ap Anlach of Brycheiniog was a legendary 5th-century king of Brycheiniog (Brecknockshire, alternatively Breconshire) in Mid Wales. Name variations Brychan had Irish ancestry and came from Ireland to Wales, therefore his original name ...

Brycheiniog Brycheiniog was an independent kingdom in South Wales in the Early Middle Ages. It often acted as a buffer state between England to the east and the south Welsh kingdom of Deheubarth to the west. It was conquered and pacified by the Normans ...

, and finds it unlikely to have been associated with a Dyfan, "because the place was always called Llandyfân with the accent on the last syllable", appearing in earlier records as Llanduvaen. There was a

holy well A holy well or sacred spring is a well, Spring (hydrosphere), spring or small pool of water revered either in a Christianity, Christian or Paganism, pagan context, sometimes both. The water of holy wells is often thought to have healing qualitie ...

nearby esteemed for treatment of

paralysis Paralysis (: paralyses; also known as plegia) is a loss of Motor skill, motor function in one or more Skeletal muscle, muscles. Paralysis can also be accompanied by a loss of feeling (sensory loss) in the affected area if there is sensory d ...

and related illnesses, known as Ffynnon Gwyddfaen or Gwyddfân. The church may have been a late erection by its owners, "the Dynevor family", as a

chapel of ease A chapel of ease (or chapel-of-ease) is a church architecture, church building other than the parish church, built within the bounds of a parish for the attendance of those who cannot reach the parish church conveniently, generally due to trav ...

for the pilgrims there.

John Stow John Stow (''also'' Stowe; 1524/25 – 5 April 1605) was an English historian and antiquarian. He wrote a series of chronicles of History of England, English history, published from 1565 onwards under such titles as ''The Summarie of Englyshe C ...

's ''Annals of England'' also lists a (since discontinued)

parish church A parish church (or parochial church) in Christianity is the Church (building), church which acts as the religious centre of a parish. In many parts of the world, especially in rural areas, the parish church may play a significant role in com ...

dedicated to "Saint Deruuian" among those in the

deanery A deanery (or decanate) is an ecclesiastical entity in the Catholic Church, the Eastern Orthodox Church, the Anglican Communion, the Evangelical Church in Germany, and the Church of Norway. A deanery is either the jurisdiction or residence of ...

Dunster Dunster is a village that is home to Celtu and civil parish in Somerset, England, within the north-eastern boundary of Exmoor National Park. It lies on the Bristol Channel southeast of Minehead and northwest of Taunton. At the 2011 Census, ...

Somersetshire Somerset ( , ), archaically Somersetshire ( , , ) is a ceremonial county in South West England. It is bordered by the Bristol Channel, Gloucestershire, and Bristol to the north, Wiltshire to the east, Dorset to the south-east, and Devon to ...

. Prior to the Dissolution of the Monasteries, his

relic In religion, a relic is an object or article of religious significance from the past. It usually consists of the physical remains or personal effects of a saint or other person preserved for the purpose of veneration as a tangible memorial. Reli ...

s were claimed by

. The

festival A festival is an event celebrated by a community and centering on some characteristic aspect or aspects of that community and its religion or cultures. It is often marked as a local or national holiday, Melā, mela, or Muslim holidays, eid. A ...

of St Deruvian does not appear in any surviving medieval Welsh

,Baring-Gould, Sabine & al
''The Lives of the British Saints: The Saints of Wales and Cornwall and Such Irish Saints as Have Dedications in Britain'', Vol. II, pp. 394–395.
Honourable Society of Cymmrodorion (London), 1911. but Cressy later listed it on 8 April. He and St Fagan took on renewed importance during the

: at his martyrdom in 1604, the Blessed

John Sugar John Sugar or Suker (1558 – 16 July 1604) was an English Catholic priest killed by the English crown in 1604. He was beatified as a martyr in 1987. Life He matriculated at the University of Oxford from St. Mary's Hall of Oriel College, 30 Oc ...

asked his Protestant accusers who had evangelized the country; receiving no answer, he listed Eleutherius, "Damianus", and "Fugatius" as evidence for the early date of

British Catholicism The Catholic Church in the United Kingdom is organised into the Catholic churches in England and Wales, Scotland, and with Northern Ireland organised as part of the Catholic Church in Ireland. All as part of the worldwide Catholic Church in ...

. Protestants, meanwhile, used the story as evidence of the separate national church. Challoner claims Deruvian was celebrated together with St Fagan at medieval Glastonbury on 3 January.Challoner, Richard.
A Memorial of Ancient British Piety: or, a British Martyrology
'. W. Needham, 1761. Accessed 14 Mar 2013. Other sources note his celebration with St Fagan on 24 May or (again with Fagan) on the festival of Pope St Eleutherius on 26 May.Baring-Gould, Sabine & al
''The Lives of the British Saints: The Saints of Wales and Cornwall and Such Irish Saints as Have Dedications in Britain'', Vol. III, pp. 9–10.
Honourable Society of Cymmrodorion (London), 1911. This last date—the traditional day of the baptism of King Lucius—is sometimes given as an observance of the

Eastern Orthodox Eastern Orthodoxy, otherwise known as Eastern Orthodox Christianity or Byzantine Christianity, is one of the three main Branches of Christianity, branches of Chalcedonian Christianity, alongside Catholic Church, Catholicism and Protestantism ...

diocese of Thyateira and Great Britain.Latin Saints of the Orthodox Patriarchate of Rome
"May"
Accessed 17 October 2012. In fact St Deruvian's Day (under any of his aliases) is currently unobserved by any of the major denominations of Wales.The Church in Wales.
The Book of Common Prayer for Use in the Church in Wales: The New Calendar and the Collects
". 2003. Accessed 18 Nov 2014.The Catholic Church in England and Wales.
Liturgy Office: Liturgical Calendar
. Catholic Bishops' Conference of England and Wales, 2014. Accessed 1 February 2015."Saints of the British Isles"
Archdiocese of Thyateira and Great Britain (London), 2015. Accessed 1 February 2015.

References

{{DEFAULTSORT:DERUVIAN Welsh Roman Catholic saints 2nd-century Christian saints Welsh Christian missionaries 2nd-century Romans