Church of Mary (Double Church)

The Church of Mary, also known as the Double Church, is one of the oldest Christian basilicas in the world, converted from a Roman grain warehouse in the 2nd or 3rd century AD and expanded several times. Its particular historical significance lies in the Third Ecumenical Council of 431, which was held here and which settled the Nestorian controversy by declaring Mary to be the Mother of God — a decision that shaped Christian theology and eventually divided the Church.

The ruins are at the northern end of the Ephesus site, near the harbour baths. They are often overlooked by visitors focusing on the Library and the Theatre, but the setting among overgrown columns and apse walls is atmospheric. The successive building phases are visible in the masonry: Roman opus mixtum beneath the Christian additions, with later Byzantine repairs on top. A small museum sign near the entrance provides context on the Council of Ephesus.

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A story
The Third Ecumenical Council of 431, which declared the Virgin Mary to be the Theotokos ("God-bearer"), was held in this building — making it one of the most important ecclesiastical sites in Christian history. The council condemned the teachings of Nestorius, the Patriarch of Constantinople, who had insisted Mary should only be called Christotokos ("Christ-bearer"). The theological dispute sounds abstract; the political consequences were enormous. Nestorianism survived and eventually spread as far as China.

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