Phraates V ( Frahāt), also known by the diminutive version of his name, Phraataces (also spelled Phraatakes), was the King of Kings of the Parthian Empire from 2 BC to 4 AD. He was the younger son of Phraates IV () and Musa, who ruled with him. Under Phraates V, a war threatened to break out between the Parthian and Roman empires over the control of Armenia and Mesopotamia. Although Augustus () had sent his adopted son Gaius Caesar to invade Iran, in 1 AD the two sides agreed a peace treaty, by which once again Armenia was recognized as being in the Roman sphere. Phraates V was in return acknowledged as the rightful Parthian king, which was of high importance to him, due to his insecure position in the country. In 4 AD, Phraates V and his mother fled to Rome after being expelled by the Parthian nobility, who crowned Orodes III as king. Name Phraátēs () is the Greek form of the Parthian Frahāt (𐭐𐭓𐭇𐭕), itself from the Old Iranian *Frahāta- ("gained, earned"). The Modern Persian version is Farhād (). Phraates V was regularly known by the diminutive version of his name, Phraataces (), meaning "the small Phraates". Background Phraates V was the son of the Phraates IV () and his Roman wife Musa, who was originally an Italian slave-girl given to him by the Roman emperor Augustus () after a treaty in 20 BC in which the Romans returned Phraates IV his kidnapped son in return for the lost legionary standards taken at Carrhae in 53 BC, as well as any surviving prisoners of war. The Parthians viewed this exchange as a small price to pay to regain the prince. Musa quickly became queen and a favourite of Phraates IV, giving birth to Phraataces (Phraates V) in . It was reportedly under her influence, that Phraates IV in 10/9 BC sent his four first-born sons to Rome in order to prevent conflict over his succession. In 2 BC, Musa had Phraates IV poisoned and made herself, along with Phraates V, the co-rulers of the Parthian empire. According to the 1st-century Roman historian Josephus, he heard a rumour that Musa enjoyed sexual relations with her son. This and the coinage of Musa with Phraates V, led to some scholars believe that the two had married. However, there is no evidence that supports this claim; neither under the Parthians,