During the civil war that followed Harun's death, Fadl retired to his estates in Iraq.
The Fourth Fitna (809–827 CE), including the Abbasid civil wars and other regional conflicts
Fourth International | Fourth Amendment to the United States Constitution | Fourth Crusade | Fourth Amendment | United States Court of Appeals for the Fourth Circuit | Fourth | Born on the Fourth of July | French Fourth Republic | fourth | Born on the Fourth of July (film) | War of the Fourth Coalition | United States Fourth Fleet | Fourth Northern Division of the Irish Republican Army | Fourth Labour Government of New Zealand | Fourth Council of Constantinople | Kuwait's Fourth District | IPCC Fourth Assessment Report | International Committee of the Fourth International | Fourth wall | Fourth-generation programming language | Fourth Doctor | BMT Fourth Avenue Line | Twenty-Fourth Air Force | The Fourth Network | Second Fitna | New Fourth Army | Fourth Reich | Fourth Geneva Convention | Fourth Fitna | Fourth Estate |