Philip the Arab (Marcus Julius Philippus) declares himself co-emperor, and makes a controversial peace with the Sassanian Empire, withdrawing from their territory and giving Shapur 500,000 gold pieces. The Sassanians occupy Armenia.
Philip the Arab is recognized by the Roman Senate as the new Roman Emperor with the honorific Augustus. He nominates his son Philippus, age 6, with the title of Caesar and makes him heir to the throne; gives his brother Priscus supreme power (rector Orientis) in the Eastern provinces; and begins construction of the city of Shahba (Syria) in the province of his birth.
The vassal Upper Mesopotamian kingdom of Osroene is absorbed into the Roman Empire, its last ruler being Abgar (XI) Farhat Bar Ma’nu.