The primary source which confirms her parentage has not yet been identified."Fulconis comitis, uxor eius Petronill" witnessed a charter dated to [1060/66] which records an agreement between "Odone de Camaziaco" and La Trinit de Vendme concerning property."Fulconem comitem Vindocinensem", on his deathbed, donated rights to Marmoutier by charter dated 1066, confirmed by "uxor eiusdem comitis Petronilla" after her husband died, witnessed by "Albericus de Monte-aureo, Ingelbaldus Brito, Wlgrinus filius Ingelbaldi, Rainaldus cantor frater ipsius Petronille, Fulcherius de Turre, Matheus de Monte-aureo, Drogo frater eius, Tetbaldus filius Leterii".A charter records the death "Kal Nov" at Chteau-Renard in 1078 of "Petronilla mater Burchardi comitis" and her donation before dying to La Trinit de Vendme of property previously held by "Fulconis comitis mariti sui", with the consent of "Burchardo filio suo comite Vindocini" (-after Nov 1066).A charter dated to  records that "Adelardus de Castro Gunteri et Rainaldus pater eius" attempted to impose unjust taxes on the bourg of Mesnil but were summoned before Pope Paschal II at the council of Troyes and agreed to desist (before 1080) BURGONDE de Nevers, daughter of ROBERT "le Bourguignon" de Nevers & his first wife Avoie [Blanche] de Sabl (-after 1126).
"Rainaldus de Castro Rainaldi uxorque mea Helisabeth" donated "ecclesiam Sancti Andre de Castro Rainaldi" to Tours, with the consent of "domini mei Gauffredi comitis", Saint-Julien by charter dated 1066, after 4 Aug [I] (-after 1060).
Guicherius iuvenis apud castrum Rainaldi...coram patre suo Guicherio et fratre suo Gauffredo, by charter dated to [1093/94] (-after [1093/94]).
Guicherius iuvenis apud castrum Rainaldi...coram patre suo Guicherio et fratre suo Gauffredo, by charter dated to [1093/94].
His parentage is confirmed by the charter dated to , quoted below, which indicates that Renaud [II] Seigneur de Chteau-Gonthier was the grandfather of Guicher [II] Seigneur de Chteau-Rainard.
However, no indication has yet been found about the identity of his mother.
Pierre de la Vergne and killed them both She married thirdly (contract 1500) Pierre btard d Armagnac Comte de l Isle-Jourdain.