The year is 312 AD, and the entire Roman enterprise hangs in the balance. Constantine marched on Rome, challenging his rival Maxentius for control of the empires vast wealth and property. On the eve of battle, a strange light pierced the sky. He saw a radiant cross and a divine promise: in this sign, he would conquer. This was a monumental investment in faith. In a startling innovation, Constantine ordered his soldiers to paint the Chi-Rho, a Christian symbol, upon their shields. Outnumbered but