A divided Islamic world offered feeble resistance to the Crusaders who consolidated their hold on the eastern Mediterranean and imposed their fiefdoms on the region. The Seljuks, preoccupied with defending their eastern flank against the Afghan Ghaznavids, had thinned out their western defenses. The pagan Turkish tribes across the Amu Darya on the northeastern frontiers were a constant menace....

Islam liberated men and women from the shackles of slavery and made them masters of the world. The history of the Mamlukes illustrates this observation. In the 9th and 10th centuries, there was a brisk slave trade down the Volga River, near the Caspian Sea. The Vikings raided Europe with unrelenting ferocity in search of booty and slaves. Eastern Europe, fossilized as it was between...

The Murabitun revolution was one of the few genuine mass movements in Islamic history. Growing out of the womb of Africa, it engulfed two continents and played a decisive role in historical developments in Africa and Spain alike. As a mass movement, European as well as Muslim scholars have studied it extensively. Ibn Khaldun used it as a basis for his theory of the rise and fall of...