Bahman becomes ill when Humay is 6 months pregnant, and upon realizing that his death is imminent, appoints Humay as vice-regent until the birth of her child. She ascended to the throne and ruled Iran after the death of Bahman. After her ascension, she gives birth to a son, Kai Darab, whom she keeps hidden for 8 months. Eventually she places Darab in a box and sets it to float down the Euphrates, where he is found by a dyer, who saves Darab and raises him.

During Humay's reign, a Roman army assaults the western edges of the Iranian Empire, and Humay sends an army under Rashnwad to fight them. During this conflict, Rashnwad finds Darab, and recognizes him as Humay's child. When they return to the capital after defeating the Romans, Humay retires and hands the throne down to her son after 32 years of rule. ^[1]

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• Emrani, Haleh (2009). Like Father, Like Daughter: Late Sasanian Imperial Ideology & the Rise of Bōrān to Power. University of California.