The Norman conquest of England in 1066 was one of the great milestones of English history but there were in fact many Norman invasions and their influence reached from Northern Europe through the Mediterranean and into the Middle East and North Africa. They were a phenomenon emerging in the tenth century but had disappeared by the middle of the thirteenth century. In the brief period though their influence was massive creating new kingdoms, re-shaping societies and leaving behind impressive architectural, linguistic and cultural influences. In this episode, Dan speaks to historian Trevor Rowley author of The Normans: The Conquest of Christendom about their origins, how and why they spread so far, what their legacy is and why their influence was so short-lived.