The Qur’an bestows upon humankind the keys to the heavens and the earth (“Do you not see that God has made subject to thee all that is between the heavens and the earth”, Qur’an, 31:20). In the golden age of their history, Muslims used these keys to unlock the secrets of nature and they created a civilization that was the marvel of the world. Then, they overreached...

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...

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....