The Church of Mary is an ancient Christian cathedral dedicated to the Theotokos ("Birth-Giver of God", i.e., the Virgin Mary), located in Ephesus (near present-day Selçuk in Turkey). It is also known as the Church of the Councils because two councils of importance to the history of Early Christianity are assumed to have been held within. The church is located in the south stoa of the Olympieion (Temple of Hadrian Olympios) next to the harbor of Ephesus.