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Former Church of St. John Prodromos in Trullo
Hırami Ahmet Pasha Mosque
John Prodromos in Trullo.jpg

The former Church of St. John the Forerunner (Hagios Ioannis Prodromos en to Troullo), now Hırami Ahmet Paşa Mescidi, is located in the northwest part of the city on the fifth hill, near the former Pammakaristos Monastery (now Fethiye Mosque). It is a cross-in-square church with a tripartite bema and a narthex. The church has long been identified with Hagios Ioannes Prodromos en to Troullo and dated to the twelfth century. However the identification and the date are not secure. 
When the Church of Pammakaristos was made the patriarchal seat in 1456, the Patriarch Gennadius had transferred the nuns previously accommodated there to this building. Ahmed Pasha converted the building into a mosque in the 16th century. In the 1960s, the building was the subject of a heavy-handed restoration, during which large parts of the exterior masonry were rebuilt. The interior was renovated in 2011.
It has also suggested that it dates to the ninth century due to the circular unadorned apses and the circular drum of the dome, which are used in the provinces in the ninth and tenth centuries but not found in the capital. In addition, the alternating bands of ashlar and brick in this building typical of Constantinopolitan construction date from the eighth to the tenth centuries, but not thereafter. The absence of recessed-brick masonry favors this date. 
Its eastern end is unusual. All three apses of the bema are semicircular inside and out, a feature uncommon in Constantinople (the other example is Sekbanbaşı). Moreover, the main apse does not communicate with the side rooms. However, the bema likely extended west to include the three eastern bays of the naos. The primary function of the building was funerary. The narthex has at least four arcosolia for burials. Two more arcosolia were located in the naos, each in the middle of the north and south walls. 

John Prodromos in Trullo (Hırami Ahmet P
John Prodromos in Trullo (Hırami Ahmet P

Aerial photo by István Pi Tóth

St. John Baptist in Trullo.jpg

From Byzantine Topographic Studies by Paspates (1877)

Pervititch. Plan d’assurances. Balat. Fetiye. Kesmekaya. No 26 (1929)

From Salt Research

en troulo.jpg

Plan by Marinis



Architecture and Ritual in the Churches of Constantinople: Ninth to Fifteenth Centuries by V. Marinis

Bildlexikon zur Topographie Istanbuls: Byzantion, Konstantinupolis, Istanbul by Wolfgang Müller-Wiener

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



John Prodromos in Trullo (Byzantine Legacy Flickr)

Byzantine Churches of Constantinople Photo Album (Byzantine Legacy Flickr)

Byzantine Churches of Constantinople (Byzantine Legacy Google Map)

Saint John the Baptist en to Trullo (Byzantium 1200)

Hırami Ahmet Paşa Camii (Nicholas V. Artamonoff Collection)

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