Passage: Polemon II's father died in 8 BC. His mother then married King Archelaus of Cappadocia, and the family had moved to Cappadocia, where Polemon II was raised, along with his siblings, at the court of his stepfather. Archelaus died in 17, whereupon Polemon II and his mother moved back to Pontus. From 17 until 38, Polemon II lived as a private citizen in Pontus and assisted his mother in the administration of their realm. When his mother died in 38, Polemon II succeeded his mother as the sole ruler of Pontus, Colchis and Cilicia.

Question: Which sole ruler of Pontus lived as a private citizen before their mothers death?
Polemon II