Description:446 Guiana HASHEM TALHAMI is struck by the absence of any mention of slaves as a .. During the reign of Harun al-. Rashid, an eighth-century 'Abbasid caliph, a popular account listed the 28'Abd al~Salam M. Haroun, ed., Majmou'ar Rasa 'i'i al-Djahr'z (“Letters of al-. Djahiz"), I (Cairo, 1964), 2