International African Institute. p. 140. ↑ A Pastoral Democracy by I. M. Lewis ↑ Saheed A. Adejumobi, The History of Ethiopia, (Greenwood Press: 2006), p.178 ↑ Encyclopædia Britannica, inc, Encyclopædia Britannica, Volume 1, (Encyclopædia Britannica: 2005), p.163 ↑ John L. Esposito, editor, The Oxford History of Islam, (Oxford University Press: 2000), p.