Guillaume de Blois, seigneur de Sully

FYI The "Ille-et-Vilaine" is a départment of France. France didn't have départment designations at this time. The départments of France arose as an idea in the late 1600s, but they didn't roll into existence until the French Revolution was underway.

Medlands

3. GUILLAUME de Blois ([1090/93]-[1150]). Orderic Vitalis records that “Stephanus Blesensis palatinus comes” and his wife had “filios quatuor: Guillelmum et Tedbaldum, Stephanumque et Henricum”, adding that Guillaume was “gener Geronis de Solleio et hæres” and “vir bonus...et pacificus, et sobole pollens atque facultatibus” (“a good and peaceful man, powerful through his descendants and his wealth”)[205]. Seigneur de Sully, by right of his wife. He was disinherited, retaining only Sully.

GUILLAUME de Blois, son of ETIENNE II Comte de Blois & his wife Adela de Normandie ([1090/93]-[1150]). Orderic Vitalis records that “Stephanus Blesensis palatinus comes” and his wife had “filios quatuor: Guillelmum et Tedbaldum, Stephanumque et Henricum”, adding that Guillaume was “gener Geronis de Solleio et hæres” and “vir bonus...et pacificus, et sobole pollens atque facultatibus” (“a good and peaceful man, powerful through his descendants and his wealth”)[771]. Orderic also provides some indication of his birth year when he records[772] that his mother Ctss Adela provided troops to Louis VI King of France at the time of the siege of Montmorency in [1108] "because Count Stephen her husband had gone on crusade and her eldest sons, William and Theobald, who were not yet of age, were unable to command troops of knights". The description is confused because Count Etienne had died several years earlier, but it nevertheless provides some indication of the comparative youth of the brothers Guillaume and Thibaut at the time. "Henricus comes cognomina Stephanus necnon et Adela uxor eius cum filiis nostris" granted immunities to Chartres Notre-Dame by charter dated [Oct 1100/1101], signed by "Stephani comitis, Adele comitisse, Guillelmi, Stephani, Odonis, Teobaldi"[773]. Comte de Chartres. Seigneur de Sully, by right of his wife. He was disinherited, retaining only Sully. According to Weir, Guillaume is described in the chronicles as an idiot, but she does not cite the primary source[774]. The comment may based on a letter of Ivo Bishop of Chartres which records that, during a dispute (dated by Chibnall to [1103][775]%29 with the chapter of Chartres that was awaiting arbitration, he forced the burgesses of Chartres to form a confederation and take a solemn oath to kill the bishop[776]. Chibnall, in order to reconcile this incident with the description of Guillaume by Orderic Vitalis ("good and peaceful man", quoted above), speculates that he was of retarded mental development and, although irresponsible, violent only in words[777].

m AGNES de Sully, daughter of GILLES [I] de Sully & his wife Edelburge de Bourges. Her parentage and marriage are indicated by Orderic Vitalis who records that “Stephanus Blesensis palatinus comes...[filius] Guillemum” was “gener Geronis de Solleio et hæres”[778]. "Post mortem Gilonis de Soiliaco, comes Stephanus Tebbaldi filius" confirmed the rights of Saint-Florent over the monastery of Saint-Gondon sur Loire by charter dated [1098/1101] which names "Willelmus filius comitis Stephani et Agnes filia Gilonis"[779].

Guillaume & his wife had five children:
1. EUDES [Archambaud] de Sully (-after 1162)....
2. RAOUL de Sully (-21 Sep 1176, bur Notre Dame de La Charité-sur-Loire)....
3. HENRI de Sully (-10 Jan [1188 or after])....
4. MARGUERITE de Sully (-14 Dec 1145)....
5. ELISABETH de Sully (-Jul 1128)....

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Wikipédia français (2 mai 2021) https://fr.wikipedia.org/wiki/Guillaume_de_Sully "Guillaume de Sully"]

enWikipédia (25 Mar 2022) "William, Count of Sully"

The Peerage Online "Guillaume de Blois, Seigneur de Sully"

Histoire des Ducs et des Comtes de Champagne pp. 168, 350n.

Mercure français vol. 30 Guillaume de Blois ou de Champagne.