In 1047 King William "Conqueror" I of England (age 19), supported by King Henry I of France (age 38), defeated a rebel army led by William's (age 19) cousin Guy Ivrea (age 22) who opposed William's (age 19) succession as Duke of Normandy at the Battle of Val ès Dunes in Caen, Calvados, Basse Normandie.

Hamon Dentatus was killed.