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HierapolisEASTON'S
Sacred city, a city of Phrygia, where was a Christian church under the care of Epaphras (Col. 4:12, 13). This church was founded at the same time as that of Colosse. It now bears the name of Pambuk-Kalek, i.e., “Cotton Castle”, from the white appearance of the cliffs at the base of which the ruins are found.
Easton's Illustrated Bible Dictionary, 3rd ed. (1897), public domain.