 With the Triumvirate renewed in 38 BC, Antony returned to Athens in the winter with his new wife Octavia, the sister of Octavian.With the assassination of the Parthian king Orodes II by his son Phraates IV, who then seized the Parthian throne, in late 38 BC, Antony prepared to invade Parthia himself.Antony, however, realized Octavian had no intention of sending him the additional legions he had promised under the Treaty of Tarentum.