A valley famous for the victory gained by Mahomet, in which “he
was assisted by 3,000 angels, led by Gabriel, mounted on his horse
Haïzum.” (Al Koran).
King of Persia, who married Giauha'rê daughter of the most powerful
of the under-sea emperors. Queen Labê tried to change him into a
horse, but he changed her into a mare instead.(Arabian Nights, “Beder and Giauharê.”)
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894