William/Guillaume I (Longsword) Duc de Normandie 203
- Født: Omkr 893
- Ægteskab (1): Sprota
- Ægteskab (2): Liutgarde|Ledgard de Vermandois i 935
- Død: 17 Dec. 942, l`Ile Picquigny, Somme, France. i en alder af ca. 49 år
 Notater:
William Longsword (French: Guillaume Longue-Épée, Latin: Willermus Longa Spata, Old Norse: Vilhjálmr Langaspjót), (c. 893 - 17 December 942) was the second ruler of Normandy, from 927 until his assassination in 942.
He is sometimes anachronistically dubbed "Duke of Normandy", even though the title duke (dux) did not come into common usage until the 11th century. Longsword was known at the time by the title Count (Latin comes) of Rouen. Flodoard-always detailed about titles-consistently referred to both Rollo and his son William as principes (chieftains) of the Norse
William/Guillaume blev gift med Sprota.
William/Guillaume blev derefter gift med Liutgarde|Ledgard de Vermandois, datter af Herbert/Heribert II de Vermandois Comte og Adela|Liegarde|Hildebrante of Neustria, i 935. (Liutgarde|Ledgard de Vermandois blev født omkring 914 og døde den 9 Feb. 978.)
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