Muhammad II now ruled as Imam over all Nizari Ismailis from his castle in Alamut, Persia whilst the Syrian Ismaili faction operated under the delegated leadership of the legendary Old Man of the Mountain. Feared by Crusaders and Saladin alike for his devoted assassins who wreaked havoc and terror in the Holy Land, he even had the King of Jerusalem assassinated in 1192.
In 1210, Muhammad II died and was succeeded by his son, Hassan III who immediately ordered his followers to embrace Sunni Islam.