Basilica Cistern

The Basilica Cistern, or Cisterna Basilica (, or , "Subterranean Cistern" or "Subterranean Palace"), is the largest of several hundred ancient cisterns that lie beneath the city of Istanbul, Turkey. The cistern, located southwest of the Hagia Sophia on the historical peninsula of Sarayburnu, was built in the 6th century during the reign of Byzantine emperor Justinian I. Today it is kept with little water, for public access inside the space.

History

This subterranean cistern was called Basilica because it was located under a large public square, the Stoa Basilica, on the First Hill of Constantinople. Prior to its construction, a great basilica stood on the spot. It had been built during the Early Roman Age between the 3rd and 4th centuries as a commercial, legal and artistic centre. The basilica was reconstructed by Illus after a fire in 476.

Ancient texts indicated that th
basilica cistern
contained gardens surrounded by a colonnade that faced the Hagia Sophia. According to ancient historians, Emperor Constantine built a structure that was later reconstructed and enlarged by Emperor Justinian after the Nika riots of 532, which devastated the city.

Historical texts claim that 7,000 slaves were involved in the construction of the cistern.

The enlarged cistern provided a water filtration system for the Great Palace of Constantinople and other buildings on the First Hill, and continued to provide water to the Topkapı Palace after the Ottoman conquest in 1453 and into modern times.

The existence of the cistern was eventually forgotten by all but the locals who still drew water from it until, in 1565, the French traveller Petrus Gyllius left a record of it. Gyllius recorded being rowed in between the columns and seeing fish swimming in the water beneath the boat.

Restoration history

1985–1987 works

The first major modern restoration of the Basilica Cistern was undertaken by the Istanbul Metropolitan Municipality between 1985 and 1987. More than 50,000 tons of silt were removed from the reservoir, uncovering the Medusa-head column bases. Elevated wooden walkways were introduced, allowing the structure to open to the public as a museum in 1987.

2020–2022 restoration

A comprehensive restoration was carried out between 2020 and 2022 by the İBB Miras team. The deteriorated iron tie-rods were replaced with stainless-steel tension rods, anchored with star-shaped plates, to improve seismic resilience.

Concrete walkways and a 50 cm-thick cement render added in the mid-20th century were dismantled. Approximately 1,440 m³ of concrete and 1,600 m³ of sediment were removed, revealing the original 6th-century Byzantine brick floor beneath.

A new modular steel walkway was installed, physically separated from the historic structure, improving structural performance and visitor experience. Conservation treatments included gentle cleaning of marble and brick surfaces to remove biological growth and salt crystallization.

New LED lighting and sensors were also installed to support atmospheric lighting and non-invasive digital exhibitions.

Legal status and conservation framework

The Basilica Cistern is part of the "Historic Areas of Istanbul," a UNESCO World Heritage Site since 1985. Nationally, it is protected under Turkey’s Law No. 2863 on the Conservation of Cultural and Natural Property as a 1st-degree archaeological site.

This classification restricts permanent alterations and mandates that all interventions be reversible and approved by the Istanbul No. 1 Cultural Heritage Preservation Board. In 2011, the board ordered the restriction of heavy vehicle traffic near the site to mitigate vibration-related damage.

Adaptive reuse and exhibitions

In 2022, the Basilica Cistern hosted the digital exhibition ''Daha Derine'' ("Going Deeper"), curated by İBB Miras. The exhibition featured contemporary artworks by Jennifer Steinkamp, Ozan Ünal, Aslı İrhan, and Ali Abayoğlu, using projection mapping, sculpture, and light to reflect on the site’s themes of memory, mythology, and water.

These installations were temporary, non-invasive, and mounted on reversible infrastructure added during the 2020–2022 restoration.

References

Features

This cathedral-size cistern is an underground chamber approximately by – about in area – capable of holding of water. The ceiling is supported by a forest of 336 marble columns, each high, arranged in 12 rows of 28 columns each spaced apart. The capitals of the columns are mainly in the Ionic and Corinthian style, with the exception of a few Doric capitals with no engravings. One of the columns is carved with raised pictures of a Hen's Eye, slanted branches, and tears, and resembles the columns of the 4th-century Triumphal Arch of Theodosius I (AD 379–395), erected in the 'Forum Tauri' Square, today's Beyazıt Square. The majority of the columns in the cistern appear to have been recycled from the ruins of older buildings (a process called 'spoliation'), likely brought to Constantinople from various parts of the empire, together with those that were used in the construction of Hagia Sophia. They are carved out of different types of marble and granite.

Fifty-two stone steps descend into the cistern which is surrounded by a firebrick wall with a thickness of and coated with a waterproofing mortar. The Basilica Cistern's water came from the Eğrikapı Water Distribution Centre in the Belgrade Forest, which lie north of the city. It traveled via the Valens (Bozdoğan) Aqueduct, and the original Mağlova Aqueduct, which was built by the Emperor Justinian.

The weight of the cistern is carried on the columns by means of the cross-shaped vaults and round arches of its roof.

The Basilica Cistern has been restored several times since its original creation. The first repairs were carried out in the 18th century during the reign of the Ottoman sultan Ahmed III in 1723 by the architect Muhammad Ağa of Kayseri. The second major repair was completed during the 19th century reign of Sultan Abdulhamid II (1876–1909). Cracks in the masonry and damaged columns were repaired in 1968, with additional restoration in 1985 by the Istanbul Metropolitan Museum. During the 1985 restoration, 50,000 tons of mud were removed from the cistern, and platforms were erected to replace the boats previously used for touring the cistern. The cistern was opened to the public on 9 September 1987. It underwent additional cleaning In May 1994. Then in 2017 it was once again closed for restoration and earthquake-proofing, reopening to the public in 2022.

Medusa column bases

The bases of two columns In the northwest corner of the cistern reuse blocks carved with the face of Medusa. The origin of the two heads is unknown, though it is thought that they were brought to the cistern after being removed from a building of the late Roman period. There is no evidence to suggest that they were previously used as column bases. Tradition has it that the blocks are oriented sideways and inverted in order to negate the power of the Gorgons' gaze.

In popular culture

The cistern was used as a location for the 1963 James Bond film '' From Russia with Love''. In the film, it is referred to as having been constructed by the Emperor Constantine, with no reference to Justinian, and is fictitiously located under the Soviet consulate. In reality it is a long way away from the former Soviet (now Russian) consulate in Beyoğlu.

The cistern plays a key role in Dorothy Dunnett's historical novel ''Pawn in Frankincense (1969),'' fourth volume of '' The Lymond Chronicles.''

In the fantasy series The Old Kingdom, the reservoir beneath the palace in Belisaere was inspired by the cistern.

The finale of the 2009 film '' The International'' takes place in a fantasy amalgam of the Old City, depicting the Basilica Cistern as lying beneath the Sultan Ahmed Mosque, which, in the film, is directly adjacent to the Süleymaniye Mosque.

In the 2011 video game, '' Assassin's Creed: Revelations'', the player-controlled character, Ezio Auditore, is given the chance to explore a section of this cistern in a memory sequence entitled The Yerebatan Cistern.

The cistern also features in Jean-Baptiste Andrea's film thriller ''Brotherhood of Tears'' (2013). In the sequence, the lead character, acting as a transporter (played by Jeremie Renier), delivers a suitcase to a mysterious client (played by Turkish actor Ali Pinar).

The cistern with its inverted Medusa pillar featured in the 2013 Dan Brown novel '' Inferno'' (as well as its 2016 film adaptation).

The cistern is featured in Age of Empires IV as one of the two Castle Age Landmarks of the Byzantines, named Cistern of the First Hill

Gallery

File:Basilica Cistern Statue.jpg, Statues in Basilica Cistern
File:Basilica Cistern1.jpg, Art installation inside Basilica Cistern
File:Cisterna Basílica, Estambul, Turquía, 2024-09-28, DD 52-54 HDR.jpg, Columns and vaults of Basilica Cistern
Cisterna Basílica, Estambul, Turquía, 2024-09-28, DD 40-42 HDR.jpg, Medusa head
Cisterna Basílica, Estambul, Turquía, 2024-09-28, DD 73-75 HDR.jpg, Atmospheric lighting now brightens up a visit to the Basilica Cistern
File:Yerebatan Sarnıcı Istanbul.jpg, Unique "peacock-eyed" column in the Basilica Cistern

See also

* Cistern of Philoxenos (Istanbul)
* History of Roman and Byzantine domes
*List of Roman cisterns
*Theodosius Cistern (Istanbul)

References

Further reading

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External links

Byzantium 1200 , Basilica Cistern
* Short BBC documentary on the Basilica Cister

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6th-century establishments in the Byzantine Empire
6th-century religious buildings and structures
Byzantine secular architecture
Cisterns in Istanbul
Cultural depictions of Medusa
Fatih
Hagia Sophia
Justinian I
Reservoirs in Turkey
Roman cisterns
Tourist attractions in Istanbul