Thomas FitzMaurice, Lord OConnello, (c. 1145 – 1213) of Shanid, was the eldest son of Maurice FitzGerald, Lord of Lanstephan by his wife, Alice (daughter of

Arnulf de Montgomery Arnulf de Montgomery (born 1066; died 1118/1122) was an Anglo-Norman magnate. He was a younger son of Roger de Montgomery and Mabel de Bellême. Arnulf's father was a leading magnate in Normandy and England, and played an active part in the A ...

).Weis, Frederick Lewis. ''Ancestral Roots of Certain American Colonists Who Came to America before 1700''. Eighth ed. (2008), p. 169. Thomas was the progenitor Burke, Bernard,
A Genealogical History of the Dormant, Abeyant, Forfeited, and Extinct Peerages of the British Empire
'. London: Harrison. 1866. p. 204 of the Geraldine House of Desmond, and brother of Gerald FitzMaurice, 1st Lord of Offaly, progenitor of the Geraldine Houses of Kildare and Leinster. In 1210, Thomas invaded

Connacht Connacht ( ; ga, Connachta or ), is one of the provinces of Ireland, in the west of Ireland. Until the ninth century it consisted of several independent major Gaelic kingdoms ( Uí Fiachrach, Uí Briúin, Uí Maine, Conmhaícne, and ...

with Geoffrey de Marisco at the head of a force of Anglo-Norman troops gathered in Munster, and of followers of Donnchad Cairprech Ó Briain,

King of Thomond The kings of Thomond ( ga, Rí Tuamhain) ruled from the establishment of Thomond during the High Middle Ages, until the Early modern period. Thomond represented the legacy of Brian Bóruma and the High Kings of Ireland of his line who could ...

. This expedition aided in forcing Cathal Crobhdearg Ua Conchobair,

King of Connacht The Kings of Connacht were rulers of the ''cóiced'' (variously translated as portion, fifth, province) of Connacht, which lies west of the River Shannon, Ireland. However, the name only became applied to it in the early medieval era, being named ...

into negotiations with

John de Gray John de Gray or de Grey (died 18 October 1214) was an English prelate who served as Bishop of Norwich, and was elected but unconfirmed Archbishop of Canterbury. He was employed in the service of Prince John even before John became king, for whi ...

Justiciar of Ireland The chief governor was the senior official in the Dublin Castle administration, which maintained English and British rule in Ireland from the 1170s to 1922. The chief governor was the viceroy of the English monarch (and later the British monarch ...

Marriage and issue

Thomas FitzMaurice married Ellinor, daughter of Jordan de Marisco, and sister of Geoffrey de Marisco, who was appointed justiciar of Ireland in 1215.,

Cokayne, George Edward George Edward Cokayne, (29 April 1825 – 6 August 1911), was an English genealogist and long-serving herald at the College of Arms in London, who eventually rose to the rank of Clarenceux King of Arms. He wrote such authoritative and standar ...

,
Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct, or Dormant. Volume III
'. London: George Bell & Sons. 1890. p. 83 and had issue: #

John FitzGerald, 1st Baron Desmond John FitzThomas, 1st Baron Desmond (died 1261) was the son of Thomas Fitzmaurice, Lord OConnello by his wife Ellinor, daughter of Jordan de Marisco, and sister of Geoffrey de Marisco, who was appointed justiciar of Ireland in 1215.Cokayne, ...

Notes

{{reflist 1140s births 1213 deaths Normans in Ireland Norman warriors FitzGerald dynasty 12th-century Irish people 13th-century Irish people