The Hagia Sophia of Istanbul is said to be of all religions. Constantine, the Roman Emperor and founder of the city, erected the original church on the site of a pagan temple in 325 AD. Not baptized until on his death bed, Constantine himself was pagan, which may explain the rather non-sectarian name, Hagia Sophia, meaning "Holy Wisdom." In 1453 conquering Turks converted the Hagia Sophia into a mosque. So it remained until 1935 when it was secularized and opened to people of all faiths as a museum.