Petinessus (Pitnisus) was a town and bishopric in the late Roman province of Galatia Secunda.
Petinessus is mentioned by Strabo;[1] Ptolemy;[2] Hierocles;[3] and Stephanus Byzantius, s. v. According to the first of these authors it was situated in the salt desert, to the west of Lake Tatta, between Lycaonia and Haimama.[citation needed]
The exact name and position of the city, which differs greatly according to various documents, is not known. William Mitchell Ramsay[4] mentions the place as near the site of Piri Begli or a little to the east of it.[citation needed]
The Notitiae episcopatuum mention it among the suffragan sees of Pessinus. It was created by Emperor Theodosius I between 386 and 395, and existed as late as the 13th century. There is a record of but one bishop, Pius, present at the Council of Chalcedon, 451.[5]