William of Winchester, Lord of Lunenburg
| William of Winchester | |
|---|---|
| Lord of Lunenburg | |
| Born | 11 April 1184 |
| Died | 13 December 1213 (aged 29) |
| Spouse | Helena of Denmark |
| Issue | Otto I, Duke of Brunswick-Lüneburg |
| House | Welf |
| Father | Henry the Lion |
| Mother | Matilda of England |
William of Winchester (11 April 1184 – 13 December 1213), also called William of Lunenburg (German: Wilhelm von Lüneburg) or William Longsword, a member of the House of Welf, was heir to his family's allodial lands in the Duchy of Saxony after the deposition of his father, Duke Henry the Lion in 1180.