
The Heptapyrgion (, ), modern Eptapyrgio (, ), also popularly known by its
Ottoman Turkish name (), is a
Byzantine
The Byzantine Empire, also known as the Eastern Roman Empire, was the continuation of the Roman Empire centred on Constantinople during late antiquity and the Middle Ages. Having survived the events that caused the fall of the Western Roman E ...
and Ottoman-era fortress situated on the north-eastern corner of the
Acropolis
An acropolis was the settlement of an upper part of an ancient Greek city, especially a citadel, and frequently a hill with precipitous sides, mainly chosen for purposes of defense. The term is typically used to refer to the Acropolis of Athens ...
of
Thessaloniki
Thessaloniki (; ), also known as Thessalonica (), Saloniki, Salonika, or Salonica (), is the second-largest city in Greece (with slightly over one million inhabitants in its Thessaloniki metropolitan area, metropolitan area) and the capital cit ...
in
Greece
Greece, officially the Hellenic Republic, is a country in Southeast Europe. Located on the southern tip of the Balkan peninsula, it shares land borders with Albania to the northwest, North Macedonia and Bulgaria to the north, and Turkey to th ...
. Despite its name, which in both languages means "Fortress of Seven Towers", it features ten, and was probably named after the
Yedikule Fortress in
Constantinople
Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
(modern
Istanbul
Istanbul is the List of largest cities and towns in Turkey, largest city in Turkey, constituting the country's economic, cultural, and historical heart. With Demographics of Istanbul, a population over , it is home to 18% of the Demographics ...
,
Turkey
Turkey, officially the Republic of Türkiye, is a country mainly located in Anatolia in West Asia, with a relatively small part called East Thrace in Southeast Europe. It borders the Black Sea to the north; Georgia (country), Georgia, Armen ...
). It served as the major redoubt of the city's acropolis, as well as the seat of its garrison commander in Ottoman times, until the late 19th century. It was then converted to a prison (Φυλακές Επταπυργίου), which remained open until 1989. References to the infamous prison abound in the Greek ''
rebetika'' songs. Restoration and archaeological work began in the 1970s and continues to this day.
History
Construction in the Byzantine period

The Heptapyrgion is located in the north-eastern corner of the city's acropolis. Although the urban core of the city essentially dates from its foundation by
Cassander
Cassander (; ; 355 BC – 297 BC) was king of the Ancient Greek kingdom of Macedonia from 305 BC until 297 BC, and '' de facto'' ruler of southern Greece from 317 BC until his death.
A son of Antipater and a contemporary of Alexander the ...
in 316 BC, the walls that defined the medieval and early modern city, and that are still visible today, date to
late Antiquity
Late antiquity marks the period that comes after the end of classical antiquity and stretches into the onset of the Early Middle Ages. Late antiquity as a period was popularized by Peter Brown (historian), Peter Brown in 1971, and this periodiza ...
, when the
Roman emperor Theodosius I
Theodosius I ( ; 11 January 347 – 17 January 395), also known as Theodosius the Great, was Roman emperor from 379 to 395. He won two civil wars and was instrumental in establishing the Nicene Creed as the orthodox doctrine for Nicene C ...
(r. 379–395) fortified the city anew. The five northern towers of the Heptapyrgion, along with the curtain wall that connects them, forming the northern corner of the acropolis, probably date to this period. Another theory, dating their construction to the 9th century, has also been brought forth.
The southern five towers and wall were built likely in the 12th century, thus forming a fortified
redoubt
A redoubt (historically redout) is a Fortification, fort or fort system usually consisting of an enclosed defensive emplacement outside a larger fort, usually relying on Earthworks (engineering), earthworks, although some are constructed of ston ...
in the interior of the city's citadel. This fortress was then maintained and rebuilt in the
Palaiologan period
The Byzantine Empire, officially known as the Roman Empire, was ruled by the Palaiologos dynasty in the period between 1261 and 1453, from the restoration of Byzantine rule to Constantinople by the usurper Michael VIII Palaiologos following its r ...
. The nature of the reconstruction and dating of the southern portion of the fort is disputed. There is no reference to this fort in the older literary sources, and the later ones are often ambiguous: a (, "fortress") is mentioned in 1208–1209 and a "kastellion with the ''
Tzakones'' of the castle" in 1235. The " of Thessaloniki" ( from , "fort") is present in the chronicles of the 14th and 15th centuries but could refer to the entire citadel and not just the Heptapyrgion.
From Byzantine citadel to Ottoman fort

The principal reliable testimony regarding the fortress is the inscription placed over its gate, which indicates that it was rebuilt by Çavuş Bey, the city's first Ottoman governor, in 1431, immediately after the
Ottoman conquest of the city:
Rather than a new construction, which has been disproved by archaeology, the work of Çavuş Bey may have been limited to the restoration of the bastions over the fort's monumental entrance. In a 1591 account, the fort, referred to as the ("Inner Castle"), serves as the residence of the city's military governor and has a 300-strong garrison. Another inscription, lost today but known from the writings of the 17th-century Ottoman traveller
Evliya Çelebi
Dervish Mehmed Zillî (25 March 1611 – 1682), known as Evliya Çelebi (), was an Ottoman Empire, Ottoman explorer who travelled through his home country during its cultural zenith as well as neighboring lands. He travelled for over 40 years, rec ...
, testified to another restoration in 1646.
An inventory of the arms and munitions contained in the various forts of the city in 1733 provides the Turkish names for the ten towers: (Lamp Tower), (Bent Tower), (Water Tower), (Ammunition Tower), (Prison Tower), (Maiden Tower), (Granary Tower), (
Barbican), (Bloody Tower), and the (Fortifications of the Gypsies). The latter three were considered as individual forts, unlike the others, which are classified as simple towers.
In the late 19th century, the fortress fell out of use as a military installation and was converted into a prison.
As a prison

During the 1890s, the fortress was converted into a prison. The exact date is not known with certainty, but the prison is mentioned in an 1899 map of the city, thus providing a
terminus ante quem
A ''terminus post quem'' ('limit after which', sometimes abbreviated TPQ) and ''terminus ante quem'' ('limit before which', abbreviated TAQ) specify the known limits of dating for events or items..
A ''terminus post quem'' is the earliest date t ...
for the change. This conversion entailed the removal of all previous buildings in the fort's interior, of which no trace now survives. The fortifications themselves were only little modified, although their role was effectively reversed: designed to protect its residents from outside dangers, they now served to isolate the inmates from the outside world.
The prison was for long the main penitentiary facility of the city and housed all convicted, regardless of sex or crime. New buildings were built along both sides of the walls to fulfill the various needs of the fort's new role. The interior courtyard was partitioned into five separate enclosures by fences radiating from a central watchtower. Three featured a two-story building housing the cells and a guard post, while the other two held the prison chapel and other annexes. A fourth cell block was situated close to the north-eastern tower, and was destroyed during the
Second World War
World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
. The exterior buildings, on the fort's southern side, housed the administration, the women's prison and, to the west, the
isolation cells.
The prison is well known through its frequent occurrence in the underground
rebetiko
Rebetiko (, ), plural rebetika ( ), occasionally transliterated as rembetiko or rebetico, is a term used to designate previously disparate kinds of urban Greek music which in the 1930s went through a process of musical syncretism and develope ...
music. Many songs feature its colloquial name,. Ιt also acquired notoriety through its use to house political prisoners during the
Metaxas Regime, the
Axis Occupation of Greece
The occupation of Greece by the Axis Powers () began in April 1941 after Nazi Germany Battle of Greece, invaded the Kingdom of Greece in order to assist its ally, Fascist Italy (1922–1943), Italy, in their Greco-Italian War, ongoing war that w ...
, and in the post-war period from the
Greek Civil War
The Greek Civil War () took place from 1946 to 1949. The conflict, which erupted shortly after the end of World War II, consisted of a Communism, Communist-led uprising against the established government of the Kingdom of Greece. The rebels decl ...
up to the
Regime of the Colonels.
Restoration
The prison functioned until 1989, when it was moved outside the city. The site was then taken over by the Ministry of Culture and the regional Byzantine archaeology service, the 9th Ephorate of Byzantine and Modern Antiquities, which moved some of its offices there. The ephorate had already been active in the restoration works of 1973 on the north-eastern curtain wall, and then again between 1983 and 1985 in the restoration of the damages caused by an
earthquake in 1978.
The systematic archaeological study and restoration of the Heptapyrgion began in 1990. The first phase ended in 1995, with the completing of a
photogrammetric architectural survey and the creation of a digital model of the fortress. Several institutes participate in the relevant projects: the
Aristotle University of Thessaloniki
The Aristotle University of Thessaloniki ( AUTh; ), often called the University of Thessaloniki, is the second oldest tertiary education institution in Greece. Named after the philosopher Aristotle, who was born in Stageira, about east of Thessa ...
, the
Cornell University
Cornell University is a Private university, private Ivy League research university based in Ithaca, New York, United States. The university was co-founded by American philanthropist Ezra Cornell and historian and educator Andrew Dickson W ...
in the
dendrochronology
Dendrochronology (or tree-ring dating) is the scientific method of chronological dating, dating tree rings (also called growth rings) to the exact year they were formed in a tree. As well as dating them, this can give data for dendroclimatology, ...
project, the Center for Preservation and Heritage of
Mount Athos
Mount Athos (; ) is a mountain on the Athos peninsula in northeastern Greece directly on the Aegean Sea. It is an important center of Eastern Orthodoxy, Eastern Orthodox monasticism.
The mountain and most of the Athos peninsula are governed ...
, and the
municipality of Thessaloniki.
Excavations have revealed the existence of an early Christian basilica, and an early Byzantine
cemetery
A cemetery, burial ground, gravesite, graveyard, or a green space called a memorial park or memorial garden, is a place where the remains of many death, dead people are burial, buried or otherwise entombed. The word ''cemetery'' (from Greek ...
church.
References
Bibliography
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{{coord, 40.644, 22.962, type:landmark_region:GR, display=title
Buildings and structures in Thessaloniki
Byzantine fortifications in Greece
Castles in Greece
Ottoman architecture in Thessaloniki
Prisons in Greece
Ottoman fortifications in Greece
Military history of Thessaloniki