According to Easton's Bible Dictionary, Thyatira (now Tepe Mezarligi) was a city of Asia Minor, on the borders of Lydia and Mysia. It is now the city of Akhisar (or Tepe Mezarligi), i.e., "white castle", in Turkey.

According to the Bible, here was one of the seven churches of the Book of Revelation (Revelation 1:11; 2:18-28). Lydia, the seller of purple, or rather of cloth dyed with this colour, was from this city (Acts 16:14). It was and still is famous for its dyeing. Among the ruins, inscriptions have been found relating to the guild of dyers in that city in ancient times.

There is a current Greek Orthodox Church diocese called Thyateira and Great Britain, which in actuality only covers the latter geographical region.