Like virtually every dynasty that ruled Persia since the 11th century, the Qajars came to power with the backing of Turkic tribal forces, while using educated Persians in their bureaucracy. In 1779 following the death of Karim Khan of the Zand dynasty, Mohammad Khan Qajar, the leader of the Qajars, set out to reunify Iran. Mohammad Khan was known as one of the cruellest kings, even by the standards of 18th-century Iran.