Geoffrey II de Château-Landon (died 1043 or 1046) was the count of Gâtinais.John Burke & Sir Bernard Burke, C.B., Burke's Peerage, Baronetage, and Knightage, Edited by Peter Townsend (Burke's Peerage Ltd., London, 1963)p. xciiiDetlev Schwennicke, Europäische Stammtafeln: Stammtafeln zur Geschichte der Europäischen Staaten, Neue Folge, Band II (Marburg, Germany: J. A. Stargardt, 1984), Tafel 82 He was the son of Hugues du Perche, Count of Gâtinais, and of Béatrice de Mâcon, the daughter of Aubry II de Mâcon.Kate Norgate, England Under the Angevin Kings, Vol. I (Macmillan and Co., London, New York, 1887), p. 250 He was one of the first known ancestors in male line of the Plantagenets.
About 1035, he married Ermengarde of Anjou, Duchess of Burgundy, daughter of Fulk III, Count of Anjou.Jim Bradbury, 'Fulk le Réchin and the Origin of the Plantagenets', Studies in Medieval History Presented to R. Allen Brown, Ed. Christopher Harper-Bill, Christopher J. Holdsworth, Janet L. Nelson (The Boydell Press, 1989), p. 27 After Geoffrey's death she married secondly Robert I, Duke of Burgundy.
Issue Together, Geoffrey and Ermengarde had: Hildegarde de Château-Landon, married c.1060 to Joscelin I, Lord of Courtenay; his famous son was Joscelin I, Count of Edessa by a different wife. Geoffrey III (1040–1096) Fulk IV (1043–1109)
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