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- William I Longsword (French: Guillaume Longue-Épée, Latin: Willermus Longa Spata, Scandinavian: Vilhjálmr Langaspjót) (893 - 17 December 942) was the second Duke of Normandy from his father's death until his own assassination. The title dux (duke) was not in use at the time and has been applied to early Norman rulers retroactively. William actually used the title comes (count).
Biography:
Little is known about his early years. He was born in Bayeux or Rouen to Rollo and his wife Poppa. All that is known of Poppa is that she was a Christian, and the daughter to Berengar of Rennes, the previous lord of Brittania Nova, which eventually became western Normandy. According to the William's planctus, he was baptised a Christian.
William succeeded Rollo sometime around 927 and, early in his reign, faced a rebellion from Normans who felt he had become too Gallicised and also from Bretons. According to Orderic Vitalis, the leader was Riouf of Evreux.
After putting down the rebellion, William attacked Brittany and ravaged the territory. Resistance to the Normans was led by Alan Wrybeard and Beranger but shortly ended with the Wrybeard fleeing to England and Beranger seeking reconciliation. However, it was not through invasion that he gained Breton territory but by politics, receiving Contentin and Avranchin as a gift from the Rudolph, King of France.
In 935, William married Luitgarde, daughter of Herbert II of Vermandois whose dowry gave him the lands of Longueville, Coudres and Illiers l'Eveque. His expansion northwards, including the fortress of Montreuil brought him into conflict with Arnulf I of Flanders.
The funerary monument of William Longsword in the cathedral of Rouen, France. The monument is from the XIVth century.
In 939 William became involved in a war with Arnulf I of Flanders, which soon became intertwined with the other conflicts troubling the reign of Louis IV. It began with Herluin appealing to William for help to regain the castle of Montreuil from Arnulf. Losing the castle was a major setback in Arnulf's ambitions and William's part in it gained him a deadly enemy. He was ambushed and killed by followers of Arnulf on 17 December 942 at Picquigny on the Somme while at a meeting to settle their differences.
By Sprota, a Breton captive and his concubine, he had a son Richard the Fearless, who succeeded him.
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893 - 942 (49 years)
(Age 85 years) 
