The Hagia Sophia is a former Christian church in the sixth century Constantinople, became a mosque in the fifteenth century under the leadership of Sultan Mehmed II. It is built on the historical peninsula of Istanbul. Since 1934, she is no longer a place of worship but a museum. Its esplanade is a measure of the glory of Byzantium. Often called the Great Church, the Basilica is dedicated to Christ, “Wisdom of God”, according to the Christian theological tradition. The dedication of the shrine is celebrated on December 25.