The fall of the Umayyad state and the establishment of the Abbasid state

This book includes among its folds a study that was published successively in the Tunisian Journal of Al -Fajr in the early twenties of this century, under the title "The fall of the Umayyad state and the establishment of the Abbasid state: reasons and results", and this study was published in eleven episodes, where the first episode was published in the number On the 23rd of Jumada al -Awwal 1339...