According to tradition, the First Crusade began at Pope Urban II's instigation and culminated in July 1099, when western European knights liberated Jerusalem. But what if the First Crusade's real catalyst lay far to the east of Rome? Countering nearly a millennium of scholarship, Peter Frankopan reveals the First Crusade's untold history.

Peter Frankopan is Director of the Oxford Centre for Byzantine Research at the University of Oxford and author of The Silk Roads.