Which preposition to use with sardis

at Occurrences 1%

He was encamped near the city of Sardis at that time.

for Occurrences 1%

Laodicea was famous for tapestries, Hierapolis for its iron wares, Cybara for its dyes, Sardis for its wines, Smyrna for its beautiful monuments, Delos for its slave-trade, Cyrene for its horses, Paphos for its temple of Venus, in which were a hundred altars.

in Occurrences 1%

When Cyrus had cemented his empire by the conquest of the Turanian nations, especially those that dwelt between the Caspian and Black seas, his attention was drawn to Lydia, the most powerful kingdom of western Asia, whose monarch, Croesus, reigned at Sardis in Oriental magnificence.

Which preposition to use with  sardis