Selçuk is the central town of Selçuk district, İzmir Province in Turkey, 2 kilometres northeast of the ancient city of Ephesus.
Its original 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. In 1914, it was renamed Selçuk after the Seljuk Turks who first led incursions into the region in the 12th century.
It was a township in Kuşadası district till 1957, when it became a district itself. Its neighbours are Torbalı from north, Tire from northeast, Germencik from east, Kuşadası from south, Aegean Sea from west and Menderes from northwest.
Selçuk is one of the most visited tourist destinations within Turkey, known for its closeness to the ancient city of Ephesus, House of the Virgin Mary and Seljuk works of art. The 6th century Basilica of St.