Mustafa I mo͝ostäfä´ [key], 1591–1639?, Ottoman sultan (1617–18, 1622–23), brother and successor of Ahmed I to the throne of the Ottoman Empire (Turkey). Set aside for incompetence, he was succeeded in 1618 by his nephew Osman II, who was executed in 1622. Mustafa, who was probably insane, returned to the throne only to be displaced by another nephew, Murad IV. During Mustafa's reign additional territory was lost to Persia.
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