Hagia Sophia (meaning: "Holy Wisdom"; Greek: Ἁγία Σοφία, romanized: Agia Sofia), formerly known as the Church of Holy Wisdom and Hagia Sophia Museum or today officially known as Hagia Sophia-i Kebîr Câmi-i Şerîfi (Holy Great Hagia Sophia Mosque), [4] [5] It is a mosque and former basilica, cathedral and museum located in Istanbul.