Map of the Roman Empire - Prusa

Prusa
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Prusa Bursa.

Prusa or Prusias (Προύσα). Some writers distinguish from this a smaller city, called P. ad Hypium or Hyppium (p??? t? G?pp?? p?ta�?) which stood northwest of the former, and was originally called Cierus (??e???), 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. - Harry Thurston Peck. Harpers Dictionary of Classical Antiquities. New York. Harper and Brothers. 1898.

Bursa. The earliest known site at this location was Cius, which Philip V of Macedonia granted to the Bithynian king Prusias I in 202 BC, for his help against Pergamum and Heraclea Pontica (modern Karadeniz Ereğli). Prusias renamed the city after himself, as Prusa. Prusa evolved into one of the largest cities of Mysia and retained its importance for the region throughout the Hellenistic, Roman and Byzantine periods. Its strategic location on the westernmost end of the famous Silk Road ensured Prusa to remain as one of the largest centers of silk trade throughout the Medieval period. - Wikipedia

Prusa Ad Oltmpum, a city of Bithynia, at the foot of Olympus m., on Odrysses fl., bet. Apollonia and Modra. Built by Prusias, on the recommendation of Hannibal. Noted for its warm baths. - Classical Gazateer

Prusa
PRUSA (Προύσα: Eth. ????sae??), generally with the addition of ?p? or p??? t? ???�p?, to distinguish it from another place of the same name, was situated at the northern foot of Mount Olympus, in Mysia. Pliny (5.43) states that the town was built by Hannibal during his stay with Prusias, which can only mean that it was built by Prusias, whose name it bears, on the advice of Hannibal. According to the common text of Strabo (xii. p.564), it was founded by one Prusias, who waged war against Croesus, for whom Stephanus B. (s. v.) substitutes Cyrus. As no such Prusias is known in the age of Croesus or Cyrus, various conjectures have been made upon the passage of Strabo, but without success. At all events, it is acknowledged by Dion Chrysostomus (Orat. xliii. p. 585), who was a native of the town, that it was neither very ancient nor very large. It was, however, as Strabo remarks well governed, continued to flourish under the Roman emperors (Plin. Ep. 10.85), and was celebrated for its warm baths, which still exist, and bore the name of the �royal waters.� (Athen. 2.43; Steph. B. sub voce T??�a.) Under the Greek emperors it suffered much during the wars against the Turks (Nicet. Chon. pp. 186, 389); when at last it fell into their hands, it was for a time the capital of their empire under the name of Brusa or Broussa, which it still bears, for it still is one of the most flourishing towns in Asia Minor. (Browne's Travels in Walpole's Turkey, vol. ii. p. 108; Sestini, Mon. Vet. p. 70; Hamilton, Researches, i. p. 71, &c.)

Ptolemy (5.1.13) and Pliny (5.43) mention a town of the same name on the river Hyppius or Hypius, in Bithynia, which, according to Memnon (cc. 29, 42, 49), had formerly been called Cierus (??e???), and had belonged to the territory of Heracleia, but had been taken by Prusias, who changed its name. But there seems to be some confusion here between Cierus and Cius, the latter of which is known to have received the name of Prusias from the king of that name. (Strab. xii. pp. 563, 566) [L.S] [2.675] - Dictionary of Greek and Roman Geography (1854) William Smith, LLD, Ed.