Possibly the Sultan Cistern (see separate page), based on the location north-east of the Church of the Holy Apostles.

Covered cistern north-east the Church of the Holy Apostles (Crow et al., 2008, p. 19). Only attested in the Patria.

See also Altuğ, 2013, p. 382-383. If this cistern is identical to the 'Sultan' cistern, it may have been supplied by the Valens Waterway.