Pytheion (), also called Pythia Therma, was a town of ancient Bithynia.

Pythia was embellished with public baths and buildings since the time of Justinian I, and was a famous resort town that people from Constantinople visited for its warm baths and their therapeutic properties.Vryonis, Speros (1971). The Decline of Medieval Hellenism in Asia Minor and the Process of Islamisation from the Eleventh through the Fifteenth Century. Berkeley: California University Press. p. 13 Its site is located near Yalova Kap in Anatolia.

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