Nicomedes IV King of Kingdom of Bithynia from 94 BC to 74 BC.
Nicomedes IV was the king of Bithynia from c. 94 BC to 74 BC. He was the first son and successor of Nicomedes III of Bithynia and Nysa.

His reign began at the death of his father. The first few years of his kingship were relatively peaceful, but soon King Mithridates VI of Pontus (the maternal grand-uncle of Nicomedes IV), one of Rome's greatest enemies during the late Republic, began harassing Bithynia's borders. Nicomedes IV's brother, Socrates Chrestus, assisted by Mithridates VI, defeated Nicomedes IV's army in 90 BC, and Nicomedes IV was forced to flee to Italy. He was restored to his throne by Manius Aquillius due to Rome's influence in the region. However, Aquillius encouraged Nicomedes IV to raid Mithridates VI's territory, prompting Mithridates VI to retaliate again in 88 BC. Nicomedes IV fled once again to Rome.

Nicomedes IV was restored to his throne in Bithynia in 84 BC. The years that followed were relatively peaceful, though Bithynia came more and more under the control of Rome. In 80 BC, young Gaius Julius Caesar was an ambassador to Nicomedes IV's court. Caesar was sent to raise a fleet using Bithynia's resources, but he dallied so long with the King that a rumor of a sexual relationship between the two men surfaced, leading to the disparaging title for Caesar, "the Queen of Bithynia".

As one of his last acts as king of Bithynia, in 74 BC, Nicomedes IV bequeathed the entire kingdom of Bithynia to Rome.
Nicomedes IV
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