Sardis

Boyd’s Bible Dictionary:

Capital of Lydia in Asia Minor
Once noted for beauty and wealth; now the miserable village of Sert-Kalessi (Rev. 3:11And unto the angel of the church in Sardis write; These things saith he that hath the seven Spirits of God, and the seven stars; I know thy works, that thou hast a name that thou livest, and art dead. (Revelation 3:1)-6). It was the residence of Croesus, renowned for riches, and Cyrus, when he conquered it, B. C. 548, is said to have captured fabulous treasure there. Alexander captured it from the Persians, and it was again sacked and captured by Antiochus, B. C. 214. It was destroyed by an earthquake. A. D. 17, but was speedily rebuilt. The art of wool-dyeing was discovered there. Seat of one of the seven churches of Asia (Rev. 3:11And unto the angel of the church in Sardis write; These things saith he that hath the seven Spirits of God, and the seven stars; I know thy works, that thou hast a name that thou livest, and art dead. (Revelation 3:1)).

Concise Bible Dictionary:

Strong’s Dictionary of Greek Words:

Greek:
Σάρδεις
Transliteration:
Sardeis
Phonic:
sar’-dice
Meaning:
plural of uncertain derivation; Sardis, a place in Asia Minor
KJV Usage:
Sardis

Jackson’s Dictionary of Scripture Proper Names:

red ones (?)

Potts’ Bible Proper Names:

The remainder; prince of joy; the sun:―capital of Lydia in Asia Minor, Rev. 3:1. {Reliquiae}