As conflicts over religious extremism dominate our front pages, the bestselling author of The Harlot by the Side of the Road presents a work of history that could not be more timely: a surprising look back at the origins of religious intolerance during the tumultuous fourth century.This is the epic story of how classical paganism, with its tolerance for many deities and beliefs, lost a centuries-long struggle with monotheism and its chauvinistic insistence on belief in one God. With his trademark blend of wit and scholarship, Kirsch traces the war of God against the gods from its roots in Ancient Egypt to its climax during the last stand of paganism the tumultuous fourth century, when two passionate, charismatic, and revolutionary Roman emperors, the Christian Constantine and the pagan Julian, changed the course of history and shaped the world we live in today.