GUILLAUME de Poitou, son of EBALUS "Mancer" Comte de Poitou & his [second wife Emillane ---] ([900]-Poitiers 3 Apr 963, bur Saint-Cyprien). The Chronicle of Adémar de Chabannes names "Willelmus…cognomento Caput stupe" as one of the two sons of "Eblo duce", specifying that he was "Arvernis, Vallatis, Lemovice et Pictavis comes…dux Aquitaniæ"[347]. The Chronico Comitum Pictaviæ names "Willelmum Caput-stupæ" as son of "Ebles Dux Aquitaniæ et Pictaviæ Comes" & his wife Adellia[348]. Ademar names "Willelmum Caputstupæ" as son of Eble and "Adelam, filiam Rosi Rotomagensis", but evidently confuses the latter with Guillaume's own wife[349]. He succeeded his father as GUILLAUME I “Tête d'Etoupes/Caput-stupæ” Comte de Poitou. He was appointed lay abbot of Saint-Hilaire-de-Poitiers in Jan 942[350]. From the start of his reign, his possession of Poitou was disputed by Hugues "le Grand" Duc des Francs [Capet][351]. "Guillelmus comes vel abba summi pontificis domni nostri Hylarii" donated property "in pago Pictavo in viccaria Pictavis" to the church of Saint-Hilaire de Poitiers by charter dated Jun 941 or 942[352]. Louis IV King of France confirmed the property of Saint-Hilaire de Poitiers, in the presence of "Guillelmus comes et marchio et frater eius Ebolus atque Rotgarius comes", by charter dated 5 Jan 942[353]. Comte d'Auvergne et de Limoges 955. Around this same time, Lothaire King of France extended the authority of Comte Guillaume over the whole of Aquitaine. Although known to history as GUILLAUME III Duke of Aquitaine, charters record him as "Guillelmus…Aquitanici ducatus comes"[354]and "Guillelmus…Pictavensiumsive Lemovicensium necne et Arvernensiumcomes insuper etiam Aquitainiæ comespalati"[355] as well as "Willelmi duci Aquitanorum cognomento Caput-Stupæ"[356]. He abdicated in 962, and became a monk at Saint-Cyprien de Poitiers[357]. The Chronicle of Adémar de Chabannes records that "Willelmo Capite stupæ" was buried "apud ecclesiam Sancti Cypriani"[358].
m ([935]) ADELA [Gerloc] de Normandie, daughter of ROBERT I [Rollo] Comte [de Normandie] & his [second] wife Popa [de Bayeux] (-after 969). Guillaume de Jumièges records that Rollo captured “Baiocasensem urbem” [Bayeux] along with "nobilissimam puellam...Popam filiam...Berengarii illustris viri" whom he married “more Danico” and by whom he had “Willelmum...filiamque...Gerloc”[359]. Robert of Torigny also names "Willermum Longum Spatam etGerloch"as children of "Rollo dux Northmannorum"and Poppa[360]. Guillaume of Jumièges records the marriage of “dux...sororem eius...Gerlco” and "Willelmus Pictavensis comes”[361]. The Chronicle of Adémar de Chabannes records the marriage of "filius Ranulfi Eblus" and "Adelam filiam Rosi Rotomagensis"[362]. The Chronico Richardi Pictavensis also records that "Heblus…PictavorumComes et Dux Aquitaniæ duxit Adelam filiam Rolli Rothomagensis"[363]. This information is contradicted by other sources, is difficult to sustain from a chronological point of view, and is presumably in error. Guillaume of Jumièges records the marriage of “dux...sororem eius...Gerlco” and "Willelmus Pictavensis comes”[364]. She adopted the name ADELA when baptised. "Guillelmi comitis, Adeleidis comitisse" subscribed a charter recording a donation to Cluny dated [963][365]. On 14 Oct 962, Lothaire King of France granted her the right to dispose of extensive property in Poitiers, la Cour de Faye, effectively putting an end tothe long disputebetween her husband and the family of Hugues "Capet". She used theproperty to found the Monastery of Sainte-Trinité[366]. "Vuillelmus dux Aquitanorum" donated property to Saint-Jean d'Angély for the soul of "…matre mea Addela…" by charter dated[971][367].
Duke Guillaume III & his wife had two children