William of Winchester, Lord of Lüneburg (d. 1213)
William of Winchester (11 April 1184 – 13 December 1213), also called in English 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.