Buheyseh

In Browning’s poem “Muleykeh,” Muleykeh is the prized mare of Hoseyn. When she is stolen, he chases the thief on Buheyseh, who is Muleykeh’s sister.

A very similar story is told in the introduction of The Arabian Art of Taming and Training Wild and Vicious Horses by P. R. Kincaid and John J. Stutzman.