House of Châteaudun
Origin of the House of Châteaudun. The House of Châteaudun descended from Gauzfred I (or Geoffrey I) whom Count Theobald I of Blois made viscount of Châteaudun in 956. Recent research makes him a direct-line agnatic descendant of the Frankish family Rorgonides. Branches of the House of Châteaudun. The House of Châteaudun split in distinct branches. Descended from Fulcuich, probably the second son of Gauzfred I, were: Genealogy. It is not clear whether Hugh, Archbishop of Tours, and Adalaud of Château-Chinon are sons or grandsons of Geoffrey I of Châteaudun. Some sources say that Geoffrey  had a son called Hugh, who was himself viscount of Châteaudun, and both the Archbishop of Tours and the Lord of Château-Chinon would in turn be his sons. The number of people called "Hugh" who were viscounts of Châteaudun is thus unclear, and the numbering of each viscount with this name could be wrong by 1. The parentage of Fulcois is also disputed. Some sources put him as the son of Geoffrey I of Châteaudun. Others claim he was his grandson-in-law through marriage to a granddaughter of Geoffrey called Melisende.