History of Palestine Orthodox Church. However, in 1090, Byzantine Emperor Alexios I Komnenos began taking reconciliatory measures towards the Papacy, with the intention of seeking western support against the Seljuqs. In 1095 his ambassadors appeared before Pope Urban II at the Council of Piacenza, to request mercenary forces, and later that year at the Council of Clermont Pope Urban II called for the First Crusade. The Kingdom of Jerusalem was a Christian kingdom established in the Levant in 1099 as a result of the First Crusade. Its control of Jerusalem and most of Palestine lasted almost a century until defeat by Saladin's forces
Pope Urban II Ravenna who held Rome as the antipope "Clement III". Gregory had repeatedly clashed with the emperor Henry IV over papal authority. Despite the Walk to Canossa, Gregory had backed the rebel Duke of Swabia and again excommunicated the emperor. Henry finally took Rome in 1084 and installed Clement III in his place. Urban took up the policies of Pope Gregory VII and, while pursuing them with determination, showed greater flexibility and diplomatic finesse. Usually kept away from Rome, Urban toured northern Italy and France. A series of well-attended synods held in Rome, Amalfi, Benevento, and Troia supported him in renewed