The remains of the "Byzantine Palace" are just outside the lower entrance to Ephesus archaeological site, on the left (north) as you arrive. The site is not open to the public, but the remains of its once massive walls can be seen behind a fence.

The enormous complex, with an area of around 4000 square metres, was built in the 5th century AD over the remains of Roman Imperial buildings. It may have been the palace of a proconsul or Byzantine strategos (governor). The north side of the building consisted of a bathing facility, and on the south side was a reception area, with sections known as the Four Conch Hall, the Apsidal Room and the Chapel. The two halves of the building were connected by a vestibule.