The 12th-century crusader Reynald de Chatillon was one of the most controversial men of his time, and his new biographer Jeffrey Lee believes he has returned to disturbing relevance in ours. Over a relatively long life with a dramatically violent end, Reynald became Prince of Antioch by marriage, endured 16 years in a dungeon below Aleppo, attempted (uniquely in Islamic history) to raid Mecca and Medina, overturned the politics of the Crusader states, and became the bitterest enemy of Saladin.