This historical account is the culmination of several years of research carried out with patience and thoroughness by the author whose avowed objective is the rehabilitation of the negro-African Bilal, the first Muezzin of Islam. of this great initiate, whom certain Arab historiographers have posthumously enslaved, are therefore returned to history in a striking way. But, aside from questioning received ideas about Bilal and his action, this work by Douai Fak Olympic is a treasure trove of information on the geography of the two Arabies (the South and the North), the races involved, the conflicts and military alliances, religions and manners, the planned elimination of the Jewish tribes of Medina ... Moving homage to the contribution of the black man in the development and expansion of Islam, this book will arouse many reactions