Africa, alone among the continents, has a majority Muslim population. Africa gave the Islamic world its first muezzin, Bilal ibn Rabah. It was home to its greatest historian, Ibn Khaldun and the birthplace of its best-known traveler, Ibn Batuta. It produced one of its few genuine mass movements, the Murabitun movement and provided the manpower for the injection of Muslim political military...

For a brief moment, towards the end of the 12th century, the Muslim world was politically united under one caliph ruling from Baghdad. This political unity, rare in Islamic history, projected itself on the military plane. In West Asia, the Crusaders were ejected from Palestine, Lebanon and Syria. Salahuddin recaptured Jerusalem in 1187. Four years later, in 1191, Muhammed Ghori of Ghazna...