Harry Thurston Peck, Harpers Dictionary of Classical Antiquities (1898)

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Prusa

or Prusias (Προῦσα).

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1.

P. ad Olympum (ἡ ἐπὶ τῷ Ὀλύμπῳ), now Brusa. A great city of Bithynia, on the northern side of Mount Olympus, fifteen Roman miles from Cius and twenty-five from Nicaea. It was built by Prusias, king of Bithynia, or, according to some, by Hannibal.

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2.

Some writers distinguish from this a smaller city, called P. ad Hypium or Hyppium (πρὸς τῷ Γ̔ππίῳ ποταμῷ) which stood northwest of the former, and was originally called Ciĕrus (Κίερος), and belonged to the territory of Heraclea, but was conquered by Prusias, who named it after himself. It stood northwest of the former. Perhaps it is only another name for Cius.