MarcusUlpius Traianus, a brilliant general and administrator was adopted and proclaimed emperor by the aging Nerva in 98 A.D. Regarded as one of Rome's greatest emperors, Trajan was responsible for the annexation of Dacia, the invasion of Arabia and an extensive and lavish building program across the empire. Under Trajan, Rome reached its greatest extent. Shortly after the annexation of Mesopotamia and Armenia, Trajan was forced to withdraw from most of the new Arabian provinces. While returning to Rome to direct operations against the new threats, Trajan died at Selinus in Cilicia.