Sardis was an ancient city at the location of modern Sart in Turkey's Manisa Province. Sardis was the capital of the ancient kingdom of Lydia, one of the important cities of the Persian Empire, the seat of a proconsul under the Roman Empire, and the metropolis of the province Lydia in later Roman and Byzantine times. The remains include the bath-gymnasium complex, synagogue and Byzantine shops. In early Christian times, Sardis was home to a significant Christian church, mentioned as one of the seven Churches of the Book of Revelation.