On 17 Dec 942 William "Longsword" Normandy I Duke Normandy (age 49) was assassinated at Picquigny by the followers of Arnulf "Great" I Count Flanders (age 52) with whom he was attending a peace conference. He was buried at Rouen Cathedral, Rouen. His son Richard "Fearless" Normandy I Duke Normandy (age 10) succeeded I Duke Normandy. Gunnora Countess Ponthieu by marriage Countess Ponthieu.