And so they are the ones that then decide to assassinate and are successful in assassinating Ali. So after the assassination of Ali, his son, Hassan, comes to power officially as the caliph, based in Kufa. But remember, you have this very powerful leader in Mawawiya with a very significant military, leading or in control of the Levant and the governor of Syria. And so they enter into a treaty. Clearly, Hassan sees the writing on the wall. He can't really fight Mawawiya by force. He really doesn't have strong control really much further than this region around Kufa.