Menahem ben Aaron was a Khazar ruler of the late 9th century. He was the son of Aaron I and the father of Benjamin. Sources Kevin Alan Brook. The Jews of Khazaria. 2nd ed. Rowman & Littlefield Publishers, Inc, 2006. Douglas M. Dunlop, The History of the Jewish Khazars, Princeton, N.J.: Princeton University Press, 1954. Norman Golb and Omeljan Pritsak, Khazarian Hebrew Documents of the Tenth Century. Ithaca: Cornell Univ. Press, 1982. Khazar rulers Jewish monarchs 9th-century rulers in Europe 9th-century Jews Jewish royalty