Hierocaesarea, a titular see of Lydia, suffragan of Sardis. This town is mentioned by Ptolemy (VI, ii, 16). Judging from its coins it worshipped Artemis Persica. The site of Hierocaesarea must have been between the villages of Beyova and Sasova, seven or eight miles southeast of Thyatira, on the left bank of the Koum-Chai, a tributary of the Hermus, and in the vilayet of Smyrna. It is mentioned as an episcopal see in all the “Notitiae Episcopatuum” until the twelfth or thirteenth century, but we know only three of its bishops: Cosinius, at Chalcedon, 451; Zacharias, at, Nicaea, 782 Theodore, at Constantinople, 879.