The church in Pergamum (modern-day Bergama) was the third to receive a letter in the Book of Revelation. While they were commended for staying true to Jesus, they were rebuked for some of them followed false teachings.
Pergamum/Pergamon was a wealthy city that was known for its healing center–the Asclepion, its library–which boasted of 200,000 volumes written on costly parchment (sheep skin) and its temples dedicated to the Emperor Trajan, Athena and Zeus.