And Yazid's interest is essentially to eliminate Hussein and his family so that you don't have any other legitimate claimants to the caliphate. Especially because, remember, Hussein is a living descendant of Muhammad. And so you then have this event where Yazid's forces intercept Hussein's caravan in Karbala. And this is known in the Shia tradition as the tragedy of Karbala. Because at Karbala, you have Hussein's family gets massacred. There's an account that his six-month-old son is beheaded and killed along with Hussein. And so this becomes the defining event of the Shia tradition, the tragedy of Karbala.