Watson's Biblical & Theological Dictionary
a city of Asia Minor, and formerly the capital of Croesus, king of the Lydians. The church of Sardis was one of the seven churches of Asia, to which the writer of the Apocalypse was directed to send an epistle, Revelation 3:1-3 .
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Watson, Richard. Entry for 'Sardis'. Richard Watson's Biblical & Theological Dictionary. https://www.studylight.org/dictionaries/eng/wtd/s/sardis.html. 1831-2.