Now it's very easy to assume that those books, because they were from a library called Bait al-Hikma, were Muslim books, but that's not the case because the caliph that built that library, his name was al-Ma'mun -- he was Harun al-Rashid's son.
Agora é muito fácil supor que esses livros, por serem de uma biblioteca chamada al-Hikma, eram muçulmanos, mas esse não é o caso porque o Califa que construiu a biblioteca, seu nome era al-Ma'mun -- ele era filho de Harun al-Rashid.