Agios Petros, Ennea Pyrgoi (Kalyvia Thorikou)
Date: 12th-13th century
The church is situated in Mesogeia, in Kalyvia Thorikou (former Kalyvia Kouvara), in the location known as Ennea Pyrgoi (Nine Towers). It is 40 km southeast of the center of Athens. Both the architectural type and the use of stone between the windows date the church between the end of the 12th and the beginning of the 13th century.
It is a two-columned, cross-in-square church with dimensions of 9,82 x 6,88. Many fragments of older buildings and tombstones have been incorporated into its rubble masonry. The wall paintings are of the same era.