Saint Athanasius of Mouzakis Church, Byzantine church in Kastoria, Greece.

Saint Athanasius of Mouzakis Church is a Byzantine church in Kastoria featuring traditional Byzantine architecture with elaborate interior frescoes. The walls are covered with depictions of saints, religious scenes, and Jesus Christ and Mary wearing imperial costumes.

The church was built in 1383-1384 by brothers Teodor II Muzaka and Stoya Muzaka as the final church constructed before Ottoman forces took control of Kastoria. This construction marked the end of one era and the beginning of another for the region.

The church is also known in Albanian as Shën Thanasi i Muzakave, after the Muzaka family that held Kastoria when it was built. Inside, look for the fresco of St. George wearing a cloak with a double-headed eagle and a star at its centre. Albanian historian Pëllumb Xhufi links that eagle to the Byzantine emblem granted to Andrea II Muzaka, and reads the figure as a Muzaka portrait.

The church stands in the Mouzaki area of Kastoria, near the shore of Lake Orestiada, and is reached on foot through the narrow streets of the old town. It is an active Greek Orthodox place of worship, so visitors should dress modestly and keep voices low. Look for the frescoes on the interior walls, including the imperial costumes of Christ and the Virgin Mary.

One fresco depicts Saint George wearing a distinctive cloak decorated with a double-headed eagle, a symbol resembling Emperor John V Palaiologos's imperial emblem. This unusual detail reveals how local artists incorporated imperial symbols into religious works.