A Double church,
 or twin church,
 is a church design found in
Close to the ruined church there was a spring of water, but no material remains have been found, which means, that this church was built originally in a completely isolated and remote place.
Regarding the possible function of the twin-church of Üçayak, this article argues for the burial and commemorative functions, which often motivated the double arrangement in Cappadocian rock-cut churches. ... The edifice is, namely, arranged as a twin church, which makes it relatively uncommon within the context of Byzantine architecture (fig. 1).