[Footnote 57: John Leo Afer, de Medicis et Philosophus
Arabibus, c. 14, apud Fabric. Bibliot. Graec. tom. xiii. p.
278, 279. This philosopher is named Esseriph Essachalli,
and he died in Africa, A. H. 516, A.D. 1122. Yet this story
bears a strange resemblance to the Sherif al Edrissi, who
presented his book (Geographia Nubiensis, see preface p. 88,
90, 170) to Roger, king of Sicily, A. H. 541, A.D. 1153,
(D'Herbelot, Bibliotheque Orientale, p. 786. Prideaux's Life
of Mahomet, p. 188. Petit de la Croix, Hist. de Gengiscan,
p. 535, 536. Casiri, Bibliot. Arab. Hispan. tom. ii. p. 9 -
13;) and I am afraid of some mistake.]