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Of the seven churches addressed by John, the fourth church, Thyatira, is the smallest yet it received the longest message. (Rev 2:18-29) This corrupt church was located 42 miles inland from the Aegean Sea in an alluvial plain between the Hermus and Calcius rivers . There were no natural geographical formations like steep mountains or deep rivers to provide it with a good base from which to defend its position. Its sole purpose was to act as the first line of defense in front of a hostile advancing army and to hinder their movement while the kingdom's main forces were mustered deeper behind the battlefront.
The history of thyatira consists of being controlled by the leading powers of the time, whether it was Alexander’s Greece, the Pergamon Kingdom, Antiochene empire, or the Roman Empire. Because it was so easily overrun, for most of it's history it remained a relatively small city compared to that of Ephesus and Pergamum. However, after Rome introduced Pax Romana, it settled into becoming a fairly peacefull city that boasted more trade guilds than in any other Asian city of its time. From excavated coins it is evident that guilds of carpenters, tent makers, bakers, bronze smiths, wool workers, potters, linen weavers, tanners and the famous dyers of purple were all active in the city. Lydia the seller of purple was from this city (Act 16:14). We do not know if this church was founded by Lydia or not, but it did grow in time to be a very wealthy church. Unfortunately it probably grew wealthy because of its members compromising their values by listening to the advice of a certain prophetess.