Aqueduct Bath Complex
The bath complex at Theotokos Kyriotissa (now Kalenderhane Mosque) is located near the east end of the Aqueduct of Valens in Constantinople. It was located not far from the Mese, the main street of Constantinople, and the Forum of Theodosius.
It was unearthed in the 1960s in the triangular space between the mosque and the Aqueduct of Valens. It was probably one of the many private baths recorded in the 5th century Notitia Urbis Constantinopolitanae. The bath complex had three rooms, with the largest room consisting of a rectangular forechamber leading a larger trefoil chamber, while the other two smaller rooms were circular chambers. A Christian basilica (the North Church of Theotokos Kyriotissa) replaced the earlier bath complex by the 6th century.
Plans drawn by Kullberg
Fountains and Water Culture in Byzantium edited by Brooke Shilling, Paul Stephenson
Oxford Dictionary of Byzantium edited by Kazhdan