Muawiyyah dies and as planned, his son Yazid succeeds him as Caliph. But there are many people in the Muslim Empire who do not agree with this.
Two of them are Husayn ibn Ali and Abdullah ibn Zubayr. They refuse to give Yazid the pledge and flee to Mecca. Ibn Zubayr begins to build alliances there while Husayn is being courted by the people of Kufah.