The title "Queen of Bithynia" generally refers to the queens who ruled or were prominent in the ancient region of Bithynia, located in what is now northwestern Turkey. Bithynia was an influential kingdom in the Hellenistic period and later became a Roman province. One of the most notable queens of Bithynia was **Nysa of Bithynia**, who was married to King Nicomedes IV.
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