In October 1066, William the Conqueror led his army to victory over Harold Godwinson and his Anglo Saxon forces. This was to begin the Norman invasion of England, inspire the famous Bayeux Tapestry and result in thousands of deaths. Many have argued that William's Conquest had the pope's support, with a supposed papal banner being carried by the Normans into battle. But is this true? And why else might this have been written into history? Daniel Armstrong is a PhD student at St. Andrews and Royal Historical Society Centenary Fellow at the Institute of Historical Research. He takes us through the evidence and explores the possible reasons for such a story.