A charter dated 29 Apr 1050 records the donation by "Guigoni…maiori, qui postea effectus est monachus…et Adelai comitissæ, et alii Guigoni, filio illius Guigonis…et uxori eius Petronillæ" to Saint-Pierre de Vienne. [According to Europäische Stammtafeln, the first wife of Guigues [IV] was Adelaide de Savoie, daughter of Oddon Comte de Chablais, Marchese di Susa & his wife Adelaida Marchesa di Susa ([1052/53]-[Schloß Twiel] early 1079, bur St Blasius). Another table in Europäische Stammtafeln shows the first wife of Guigues Comte d'Albon as "Adelais (von Turin)" and their son Guigues [V] Comte d'Albon as co-heir of Adelaida Marchesa di Susa in 1091. The basis for this hypothesis has not been found, but it is unlikely to be correct considering Adelaide's estimated birth date. On the other hand, it is likely that the wife of Guigues [IV] was a descendant of Adelaida Marchesa di Susa, assuming that it is correct that his son Guigues [V] was one of her co-heirs in 1091. If that is correct, it is possible that his wife was the daughter of Adelaida’s second marriage to Enrico di Monferrato, and therefore born in [1039/41]. If Guigues [IV]’s wife was Petronille named in the charter quoted above, she would have still been a child at the time of that marriage.]
The necrology of the priory of Saint-Robert records the death "V Id Sep" of "la comtesse Pétronille, épouse de Guigues le Gras et mère de Guigues le comte". Her burial place is confirmed by the charter dated 1106 under which "dominus Vuigo comes et uxor eius Regina quæ fuit de Anglia" confirmed a donation to Domène which states that "matris suæ" was buried in the monastery. 1
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