The Church of the Holy Apostles in Leontari is one of the most significant examples of late Byzantine architecture in Greece. It belongs to a small group of monuments that adopt the characteristic architectural type of Palaiologan church construction, as it was developed in Mystras. The church was already known to European travelers in the Peloponnese from the early 19th century. Originally dedicated to Christ the Life-Giver, it underwent repeated alterations during the period of Ottoman rule. During the First Ottoman Occupation, the church was converted into a mosque, and after the Second Venetian Rule—when the Peloponnese returned to Ottoman control—it was transformed into a mosque once again, this time with more extensive interventions. Notably, the minaret—of which only the base survives today—was built upon the lower section of the Byzantine bell tower, whose interior was filled in. The scale and intensity of these modifications are directly linked to the particular importance of Leontari at the time, when it hosted a sizeable Muslim population. After the Greek Revolution and the establishment of the modern Greek state in the 19th century, the church was reconsecrated for Christian worship: the minaret was demolished and a new, smaller bell tower was constructed.