Aristobulus had went to war against the Ituraeans and taken territory from them. The conquered Ituraeans and the inhabitants had to accept Jewish law and be circumcised if they wanted to remain in their land. The Ituraeans were an Arab tribe that expanded their settlement from the Lebanese Beq'a to the Golan and Mount Hermon in the second century BCE after the collapse of the Seleucid Empire. They are first mentioned in Josephus's Antiquities 13.319 during Aristobulus I's conquest where Josephus writes, he brought over to them a portion of the Ituraean nation.