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In page Sardis:

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Sardis retained its titular supremacy and continued to be the seat of the metropolitan bishop of the province of Lydia, formed in 295 AD. It was enumerated as third, after Ephesus and Smyrna, in the list of cities of the Thracesion thema given by Constantine Porphyrogenitus in the 10th century. However, over the next four centuries it was in the shadow of the provinces of Magnesia-upon-Sipylum and Philadelphia, which retained their importance in the region.[citation needed]