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Source: Britannica: William I duke of Normandy

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Titre	Britannica: William I duke of Normandy

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GUILLAUME Duke Of Normandy de Normandie RO01 HP02

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Alternative Titles: Guillaume Longue-Épée, William Longsword William I, also called William Longsword, French Guillaume Longue-épée, (died Dec. 17, 942, Picardy [France]), son of Rollo and second duke of Normandy (927–942). He sought continually to expand his territories either by conquest or by exacting new lands from the French king for the price of homage. In 939 he allied himself with Hugh the Great in the revolt against King Louis IV; through the mediation of the pope, the war ended, and Louis renewed William’s investiture of Normandy (940). William, however, continued his territorial ambitions, especially northward. Drawn to a conference on an island in the Somme River, he was assassinated on the orders of the count of Flanders, Arnulf I.

Alternative Titles: Guillaume Longue-Épée, William Longsword

William I, also called William Longsword, French Guillaume Longue-épée, (died Dec. 17, 942, Picardy [France]), son of Rollo and second duke of Normandy (927–942). He sought continually to expand his territories either by conquest or by exacting new lands from the French king for the price of homage. In 939 he allied himself with Hugh the Great in the revolt against King Louis IV; through the mediation of the pope, the war ended, and Louis renewed William’s investiture of Normandy (940). William, however, continued his territorial ambitions, especially northward. Drawn to a conference on an island in the Somme River, he was assassinated on the orders of the count of Flanders, Arnulf I.