The County of Châteaudun was held in the 9th century by counts who also held the County of Blois. Theobald I created the first Viscount of Châteaudun with the appointment of Geoffrey I, founder of the House of Châteaudun. The viscounts were entrusted with the government of the county of Châteaudun, records of whom are continuous from the mid-10th century. The actual rule of Châteaudun between the late 9th and the mid-10th centuries, and the relationships between the count and viscounts, is uncertain. The county was revived in 1439 when the region was recreated as the County of Dunois and granted to Jean Levieux Valois des Orléans, the illegitimate son of Louis I, Duke of Orléans, son of Charles V, King of France. Châteaudun is closely associated with the County of Perche and the early rulers generally held both titles of Viscount of Châteaudun and Count of Perche. There are also close ties between these counts and the Counts of Anjou, and members of the House of Ingelger and House of Plantagenet descended from this line. The family tree of the House of Châteaudun is most illustrative of these relationships. The following lineage shows the Counts of Châteaudun, the Viscounts of Châteaudun, the related Counts of Perche, and their related Counts of Anjou. Dates shown are the approximate dates of rule. Counts of Châteaudun The following are the known Counts of Châteaudun:
Odo II, brother of the previous, also Count of Troyes, Blois, Chartres, Beauvais and Tours.
Viscounts of Châteaudun The position of Viscount of Châteaudun was created by Theobald I in 967. As noted above many of the early Viscounts of Châteaudun were also Counts of Perche.
The line of Viscounts of Châteaudun ended with the rule of Clemence. Counts of Perche that were Descendants of Geoffrey I, Viscount of Châteaudun The lines of Viscounts of Châteaudun and Counts of Perche diverged in 1080 with Geoffrey II. The Counts of Perche that were from the House of Châteaudun were:
Geoffrey II du Perche, Count of Perche and Mortagne, son of Rotrou I de Perche, Viscount of Châteaudun
Counts of Anjou that were Descendants of Geoffrey I, Viscount of Châteaudun As noted above, the Viscounts of Châteaudun were closely related to the Counts of Anjou. The direct descendants of the founder of the House of Châteaudun include:
The line of viscounts of Châteaudun became extinct in 1249, with the death Geoffrey VI of Châteaudun. The lineage of the Counts of Perche, extinct by 1217, ending with Thomas du Perche. The lineage of the counts of Anjou, who acquired the land by the marriage of a grandson of Fulcois, Geoffrey II, Count of Gâtinais, with Ermengarde of Anjou, heiress of the House of Ingelger, continued on to modern times. Their great-grandson in direct agnatic line was Geoffrey V, Count of Anjou. The House of Plantagenet descended from this line.
