After the decay of the Fatimid political system in the 1160s , the Zengid ruler Nūr ad-Dīn had his general , Shirkuh , seized Egypt from the vizier Shawar in 1169 .
After the decay of the Fatimid political system in the 1160s , the Zengid ruler Nūr ad-Dīn had his general , Shirkuh , seize Egypt from the vizier Shawar in 1169 .