In later antiquity and Medieval/Byzantine times Christendom replaced the worship of Hera with the worship of Zoodochos Pigi (the life-giving fountain, meaning the Mother of Jesus, Mary). From 337 till mid 13th century Kefalari belonged to the Byzantine Empire, until French as well as Italian knights and mercenaries conquered Peloponnese for their own as a result of the 4th Crusade in 1204 AD. In the 15th century, Kefalari under Byzantine control again until the Ottoman Turks conquered Peloponnese in 1460 AD.