Note 4 — Chapter X
Reading edition
He was supposed to be in secret addicted to the forbidden study of Natural Science and Astrology.—Al Makk., i. 141. Yet he let the faquis make an "index expurgatorius" of books to be burnt.—Dozy, iii. 115. His namesake, Yakub Almansur (1184-1199), ordered all books on Logic and Philosophy to be burnt.