Cius, later renamed Prusias on the Sea after king Prusias I of Bithynia, was an ancient Greek city bordering the Propontis, in Bithynia, and had a long history, being mentioned by Aristotle, Strabo and Apollonius Rhodius. It was colonized by the Milesians and became a place of much commercial importance. It joined the Aetolian League, and was destroyed by Philip V of Macedon in the Second Macedonian War. It was rebuilt by Prusias I of Bithynia who renamed it for himself. An important chain in the ancient Silk Road, it became known as a wealthy town.