The Church of the Holy Trinity in Vasiliko is considered one of the finest examples of Byzantine church architecture in Corinthia. It was built in the 13th century AD, using construction materials from the buildings of Ancient Sikyon. Many historians speculate that it was constructed around the same time as the castle of Vasiliko, in 1248, during the rule of William II of Villehardouin, a Frankish lord known for his spirit of religious tolerance and Philhellenism.
The original church was a single-aisled structure with an octagonal dome and three-sided apses in the sanctuary. It seems to have undergone renovations and additions at various stages, with the most significant changes occurring in the 16th century when it was extended to the west, and a hundred years later with the addition of the external narthex and the bell tower. It was officially designated as a parish church by Royal Decree on July 29, 1911.
The Holy Church is classified as a Byzantine monument and is supervised by the 25th Ephorate of Byzantine Antiquities, which also oversees its maintenance. Recently, extensive renovation and structural reinforcement works were completed, highlighting the architectural quality of the building. From its cobbled courtyard, visitors can gaze eastward over the plain of Vocha and the Elisson stream, gaining a profound and experiential understanding of the area's historical importance and strategic significance.
