Seljuk raids began in the 1060s and 1070s, but it was not until 1086 that the Seljuk sultan Malik-Shah I unified the province under his control. The advent of the Crusades re-established the division between a Christian north (the County of Edessa) and a Muslim south, which lasted until the mid-12th century. The Ayyubids gained control of the region under Saladin, and kept it until the Mongol invasion of the Levant in 1260.