The Hagia Sophia, (Greek Ἁγία Σοφία / Hagia Sophia, which means "Holy Wisdom", "Divine Wisdom," a name taken in Turkey as Ayasofya) is a former Christian church in Constantinople the 6 th century, now a mosque the 15 th century under the leadership of Sultan Mehmed 2. It is built on the historical peninsula of Istanbul. Since 1934, it 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. Roger.