In 1255, Mongols led by Hulagu Khan invaded parts of Persia, and in 1258 they captured Baghdad putting an end to the Abbasid caliphate. In Persia and surrounding areas, the Mongols established a division of the Mongol Empire known as the Ilkhanate, building a capital city in Tabriz. The Ilkhanate Mongol rulers abolished the inequality of dhimmis, and all religions were deemed equal. It was shortly after this time when one of the Ilkhanate rulers, Arghun Khan, preferred Jews for the administrative positions and appointed Sa'd al-Daula, a Jew, as his vizier. The appointment, however, provoked resentment from the Muslim clergy, and after Arghun's death in 1291, al-Daula was murdered and Persian Jews in Tabriz suffered a period of violent persecutions from the Muslim populace instigated by the clergy. The Orthodox Christian historian Bar Hebraeus wrote that the violence committed against the Jews during that period "neither tongue can utter, nor the pen write down".