E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Beder.
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.)
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Beder. King of Persia, who married Giauharê, 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.)