The Book of Idols (Kitāb al-ʾAṣnām), written by the Arab scholar Hisham ibn al-Kalbi (737–819), is the most popular of the Islamic-era works about the gods and rites of pre-Islamic Arab religions.[1] The book portrays pre-Islamic Arabian religion as predominantly polytheistic and guilty of idol worship (idolatry) before the coming of Muhammad, including at the Kaaba, the pre-eminent shrine of Mecca. This, for Ibn al-Kalbi, was a degraded state of religious practice since the pure monotheism that, in Islamic religion, was instituted by Abraham (a hanif) when the Kaaba was founded.[2][3]