killed by servants of Theobald of Blois and Arnulf of Flanders 1 2

He was ambush and assinated by servants of Theobald of Bolois andArnulf of Flanders on the island of Picquigny in the SoHe was assinated in France, He was killed by Louis, son of CharlesIII.
also called WILLIAM LONGSWORD, French GUILLAUME LONGUE-Ã¢EPÃ¢EE...Hesought continually to expand his territories either by conquest or byexacting new lands from the French king for the price of homage. In939 he allied himself with Hugh the Great in the revolt against KingLouis IV; through the mediation of the pope, the war ended, and Louisrenewed William's investiture of Normandy (940). William, however,continued his territorial ambitions, especially northward. Drawn to aconference on an island in the Somme River, he was assassinated on theorders of the count of Flanders, Arnulf I."He was the 2nd Duke ofNormandy.