Hadrian , A.D. 76–138, Roman emperor (117–138), b. Spain. His name in full was Publius Aelius Hadrianus. An orphan, he became the ward of Trajan. Hadrian distinguished himself as a commander (especially in Dacia) and as an administrator. Nevertheless, Trajan's choice, announced after his death, of Hadrian as his successor, caused some discontent in Rome. Hadrian's reign was vigorous and judicious. He proved his military skill in pacifying (118) Moesia. Abandoning the aggressive policy of Trajan in Asia, he withdrew to the boundary of the Euphrates. In Palestine, however, he proved himself ruthless. His Romanizing policy aroused opposition, especially when he excluded the Jews from Jerusalem. He put down (A.D. 132) the insurrection of Bar Kokba with great severity; the ensuing war (132–135) was the most difficult of his reign. In Rome he was generous in offering circuses and in giving alms to the poor, and he enlarged and reformed the civil service.