Selçuk is a town in İzmir Province in the Aegean Region of Turkey. It is located 2 kilometres northeast of the ancient city of Ephesus, that was once home to the Temple of Artemis, one of the Seven Wonders of the Ancient World.
Its previous Greek name, Agios Theologos, referred to John the Theologian, because emperor Justinian had erected there a basilica in honour of the saint. Ayasoluk is a corrupted form of the original name.
In the 14th century, it was the capital of the Beylik of Aydin, and visited by Ibn Battuta. He noted, "The congregational mosque in this city is one of the most magnificent mosques in the world and unequaled in beauty." Under the Ottoman Empire, it was known as Ayasoluk.
Wikipedia https://en.wikipedia.org/wiki/Selçuk
Coordinates 37°57'2.637" N 27°22'11.404" E