Agios Sostis is a small village located at the borders of Arcadia, Elis and Messenia regional units, in southern Greece.

Agios Sostis' history is closely related to the historical region of Gorena – the ancient city of Lykoa according to archaeologists - situated in the northwestern part of Mount Lykaion and next to the settlement of Tsouraki (a Turkish word for a small hut).

The church is built on the ruins of a Byzantine monastery that the Franks destroyed in the 14th century.

During these excavations, 60 cells, a golden tong, a chalice and a limestone cross were found.

The neighboring villages contributed to the construction of the church and established an annual feast held at the August 29, attracting many visitors from nearby villages.