The church of Saint Basil of Caesarea (Agios Vasilios) is located in the center of the historic village of Agios Vassilios or Kato Sivritos, which was the seat of Castelo San Baseglio and gave its name to the province of Agios Vasilios. It consists of the original 13th-century dome-shaped cruciform temple, with a second aisle added in the second half of the 19th century.
The first antenna dedicated to Saint Paraskevi survives from the first temple. This section communicates with the newest through an arched opening in the sanctuary and a larger arch in the main temple. According to local tradition the temple had 100 doors, as it was impressive due to many arches.
Traces of frescoes dating from the first half of the 13th century are preserved and attributed to a painter following the 12th-century iconographic Comnenean tradition. We can see part of the Dormition of the Virgin Mary, the Apostle Paul, and saints.