William XI[1] or William XII was the Count of Auvergne and Boulogne from 1277 until his death no later than 1279.[2]
William was the eldest son of Count Robert V, as attested in the latter's will. He is first mentioned with the title count in an arrêt of the Parlement of Paris in 1276.[1] There is only one unreliable modern copy of a charter from Boulogne dated 1277 that directly attests William's brief rule of Auvergne. He was dead by 1279 and was succeeded by his brother, Robert VI. He was buried in the abbey of Bouschet.[2]
William married a daughter of Humbert V of Beaujeu, constable of France, although she is unnamed in the sources.[2]
- ^ a b Étienne Baluze, Histoire généalogique de la maison d'Auvergne justifiée par chartes, titres, histoires anciennes & autres preuves authentiques, Vol. 1 (Paris, 1708), p. 106.
- ^ a b c L'art de vérifier les dates des faits historiques, des chartes, des chroniques et autres anciens monuments, depuis la naissance de Notre-Seigneur, Vol. 10 (París, 1818–1819), p. 144.