 After a Janissary rebellion led to the deposition and assassination of Osman II in 1622, Mustafa was restored to the throne and held it for another year.Nevertheless, according to Baki Tezcan, there is not enough evidence to properly establish that Mustafa was mentally imbalanced when he came to the throne.Mustafa "made a number of excursions to the arsenal and the navy docks, examining various sorts of arms and taking an active interest in the munitions supply of the army and the navy."