From the Wikipedia:

The Church of Mary close to the harbor of Ephesus was the setting for the Third Ecumenical Council in 431, which resulted in the condemnation of Nestorius. A Second Council of Ephesus was held in 449, but its controversial acts were never approved by the Catholics. It came to be called the Robber Council of Ephesus or Robber Synod of Latrocinium by its opponents.

I show some pictures of the bishop's palace (in ruins) to the East also.