When his father Paerisades died in 310 BC, Satyrus inherited the throne and government as he was the eldest son. Shortly after, his brother Eumelus fled to the lands of the
Siraces, where he entered into an alliance with
Aripharnes, king of the Siraces, and made a rival claim to the throne. As soon as Satyrus learned of this, he set out against his brother Eumelus with his army thus starting the
Spartocid civil war. Satyrus' army had a total of 34,000 troops, a mixture of Greeks, Thracians, and Scythians. After cornering his younger brother, they fought the
Battle of the River Thatis, which resulted in a strategic victory for Satyrus and demonstrated his suitability for the throne of his father. During his reign, the minting of Panticapaeum coins continued. In particular, the Bismuth Coin of Panticapaeum was minted - this is the only known ancient coin whose main metal is bismuth. ==Final battle and death==