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.
É fácil presumir que esses livros fossem livros muçulmanos, porque eram de uma biblioteca  chamada Al-Hikma, mas não é esse o caso porque o Califa  que construiu essa biblioteca — chamava-se al-Ma'mun era o filho de Harun al-Rashid —