History is infinitely elastic. The actions of one person in any age cause ripples that affect the lives of thousands who live downstream. Mahmud of Ghazna is important in Islamic history because his actions set the tone for the interaction between the world of Islam and the world of the Hindus. The tone of that interaction created a bitterness that has been exploited by extremists in the...

The origins of the Ottoman Empire are to be found in a combination of Turkish asabiyah and the Islamic spirit of ghazza (meaning, struggle in the cause of God). Asabiyah, a term used by Ibn Khaldun to denote tribal cohesion, is the force that holds together tribes through bonds of blood, a characteristic found in abundance among peoples of the desert and the nomads of...