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Toklu Dede Mosque

From Paspates (1877)

This unknown Middle Byzantine church was located in the northwest corner of Constantinople, just within the Heraclian Walls. The Church of Panagia Blachernai and Atik Mustafa Pașa Mosque are located south and southeast respectively.  
The church was a single-nave structure measuring approximately 14 x 7 meters. It had a single apse flanked by two shallow niches on its eastern walls. A wide dome covered its square naos which was preceded by a narthex. Fragments of fresco decoration, dating to the fourteenth century, included busts of saints (including St. Hagia Eleutherios, Aberkios, Polycarp, Spyridon, Prokopios and Niketas) and the Nativity in the sanctuary were recorded before its destruction. It has frequently been identified with the Church of St. Thekla, which was located in the confines of the Blachernai Palace. Supposedly converted into a mosque by Toklu Ibrahim Dede, it was the location of Ebü Seybet-ül-Hudri, a companion of the Prophet Mohammed who was killed during the Arab siege of Constantinople.
It was largely destroyed in 1929, leaving only part of its apse and south wall. At this time, a large number of stamped bricks were recovered, evidently reused materials of the fifth and sixth centuries. Its construction techniques suggest that it was built around the eleventh century. 

 Eski Eserleri Koruma Encümeni (c. 1923)

Gertrude Bell (May 1905)

Artamonoff (March 1937).jpg
Istanbul Archaeological Museums

Marble Basket Capital (Inv. No. 4485)
Toklu Dede Mosque, Ayvansaray
First half of the 6th century

Detail of Ayvansaray Plan

Pervititch (1929)

From Salt Research

Reconstruction by Pasadaios

38floorplan.jpg

Plan by Mathews

Sources

Architecture and Ritual in the Churches of Constantinople: Ninth to Fifteenth Centuries by Vasileios Marinis
Bildlexikon zur Topographie Istanbuls: Byzantion, Konstantinupolis, Istanbul by Wolfgang Müller-Wiener 
Brickstamps of Constantinople by Jonathan Bardill

Converted Byzantine Churches in Istanbul: Their Transformation Into Mosques and Masjids by S. Kirimtayif

Resources
Toklu Dede Mescidi (Byzantium 1200)

Toklu Dede Mescidi (NYU Byzantine Churches of Istanbul)

Toklu Dede Mescidi (Nicholas V. Artamonoff Collection)

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