Prusias I Chlorus (c.230 BC - 182 BC) was the king of Bithynia. The son of Ziaelas, he formed a marriage alliance with Philip V of Macedonia.
Prusias fuoght a war against Byzantium (220 BC), then defeated the Gauls that Nicomedes I had invited across the Bosporus (218). He expanded the territories of Bithynia in a series of wars against Attalus I of Peramum and Heraclea on the Black Sea. Philip V granted him the ports of Cius and Myrleia in 202, which he renamed Pruisas and Apameia respectively.
He was succeeded by his son Prusias II.
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