The Mosque viewed from the southeast in 2012 |Architectural
type||Church with Greek cross plan| |Architectural style||Middle
Byzantine - Comnenian| Kalenderhane Mosque (Turkish:
Kalenderhane Camii) is a former Eastern Orthodox church in
Istanbul, converted into a mosque by the Ottomans. With high
probability the church was originally dedicated to the Theotokos
Kyriotissa. This building represents one among the few extant
examples of a Byzantine church with domed Greek cross plan. The
mosque is located in the Fatih district of Istanbul, Turkey, in
the picturesque neighborhood of Vefa, and lies immediately to
the south of the easternmost extant section of the aqueduct of
Valens, and less than one km to the southeast of the Vefa Kilise
Mosque. The first building on this site was a Roman bath,
followed by a sixth-century (the dating was based on precise
coin finds in stratigraphic excavation) hall church with an apse
laying up against the Aqueduct of Valens. Later – possibly in
the seventh century – a much larger