Both Mohammad Ali and Abol-Fath only held nominal power during their reigns, as their uncle was the effective master of the government.
On the other hand, Zaki Khan had levied high taxes on the landlords and put to death and tortured anyone who had resisted.
Subsequently, his own army rebelled and killed Zaki Khan as he was marching on Isfahan, on June 6, 1779.
Upon reception of the news of Zaki Khan's demise, on June 19, 1779, he had Abol-Fath proclaimed sole official ruler of Iran.
Sadeq held the real power, while Abol-Fath, according to most accounts, was satisfied with a life of pleasures, and did not take any part in the administration of the Empire.