Commentary
Charles Cawley: "Primary sources assign two different parentages to the widow of Vicomte Aimery [VI] who married King Ramiro. The first possible origin is suggested by the Chronicle of Saint-Maxence, which records that "Willelmo comiti..." (indicating Guillaume VII Comte de Poitou) & his wife had five daughters, one of whom married "vicecomiti Toarcensi". Although this source does not name the Vicomte de Thouars in question, it suggests that the wife of Aimery [VI] was AGNES de Poitou, daughter of GUILLAUME IX Duke of Aquitaine [GUILLAUME VII Comte de Poitou] & his second wife Philippa de Toulouse. However, as there were several individuals in the Thouars family who bore the title "Vicomte de Thouars" at the same time, it is possible that this marriage refers to a different Vicomte from Aimery [VI]. Nevertheless, the Gestis Comitum Barcinonensium apparently corroborates this Aquitainian origin when it records that "Raimirus" (referring to Ramiro II King of Aragon) married "sororem comitis Pictaviensis" after leaving his monastery following his accession. The Crónica de San Juan de la Peña states that "Don Ramiro el monje" married "la filla del conde de Piteus". The Chronica Adefonsi Imperatoris also records the marriage of Ramiro and "the sister of the count of Poitou". It should be noted that Europäische Stammtafeln refers to Agnes as the illegitimate daughter of Duke Guillaume IX by his mistress Amauberge, but the primary source on which this is based has not yet been identified. The second possible origin is provided by a fragmentary chronicle of the dukes of Aquitaine which specifically records the marriage of "Aimericus de Theofagiis vicecomes...de Thoarcio" and "Mahaudam [Agnes dicta] ex prosapia sua [=Willelmus Pictaviensis comes]...filia Willelmi de Podio-Fagi qui Franciæ camerarius erat in vita Regis Philippi". If correct, this would mean that she was AGNES [Mathilde] du Puy-du-Fou, daughter of GUILLAUME du Puy-du-Fou & his wife Adela ---. Another possible explanation for this confusion is that Aimery [VI] married twice, although if this is correct, it would not be clear which of the above named individuals was his widow who married King Ramiro."
Family
ClaimDetailEvidence
Spouse 2ndRamiro II, King of Aragon (1086-1157) 
Child +Petronila, Queen of Aragon (1135-1174) [S756] [S958] [S963]
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Attributes
ClaimDetailEvidence
GenderFemale
NameAgnes of Poitou [S756]
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NameAgnes [S958]
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NameMathilde [S958]
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NameAges d'Aquitaine [S963]
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FatherWilliam IX, Duke of Aquitaine (1071-1127) [S756]
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MotherPhilippa de Toulouse (~1079-1117) [S756]
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Timeline
ClaimDateDetailAgeEvidence
Birth1103France [S958]
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Marriage 1stbef 1117 [S958]
Aimery VI, Viscount of Thouars
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Marriage 2nd1135Ramiro II, King of Aragon (1086-1157), Jaca, Huesca, Aragón, Spain [S958]
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Deathbef 1161 [S958]
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Sources
IndexTitle
[S756] Weis, Frederick Lewis, "Ancestral Roots of Sixty Colonists Who Came To New England before 1700, 7th Ed." (Genealogical Publishing Co., Inc., Baltimore, 1999).
[S958] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Aragon Kings)" (2006-7 (v1.1 Updated 19 August 2007)).
[S963] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Catalonia)" (Novmber 6, 2017) (https://fmg.ac/Projects/MedLands/CATALAN NOBILITY.htm).