Thyatira
   a city of Asia Minor, on the borders of Lydia and Mysia. Its
   modern name is Ak-hissar, i.e., "white castle." Here was one of
   the seven churches (Rev. 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.
   

Thyatira, a perfume; sacrifice of labor