A charter dated to [1100] relates details of a dispute between the bishop and counts of Albon which names "Guigo Vetus, pater Guigonis Crassus…Guigoni comiti, filio Guigonis Crassis". "Malleni episcopi Gratianopolitani et Wigonis comitis et uxoris eius Adelsendis, filiorumque suorum Umberti et Wigonis" signed a charter dated 26 Aug 1035 relating to the donation of four churches in Vico to the abbey of Saint-Chaffre. 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. "…Guigo comes et filius eius Guigo…" witnessed the charter dated 27 Jan 1052 which records an agreement between the archbishop of Vienne and the canons of the church of Romans. "Guigo comes qui nomine vocor senex atque filius meus Guigo pinguis" donated property to Oulx by charter dated 1063.
Comte d'Albon. "Wigo Albionis comes" named "fratres mei Guigonis cognomento Raimundi, Richardi, Armannique" in his donation to Cluny dated 1079. "Vuigo comes" donated property "in parrochia Heroneii" to Domène by undated charter. "Wigo…comes" confirmed a donation to Cluny by charter dated [1100]. "Guigonis comitis, filii Guigonis Veteris…" subscribed the charter dated 22 Jan 1105 relating to a donation to the cathedral of Grenoble.
Chorier’s Histoire de Dauphiné states that an epitaph in the priory of Saint-Robert records the death 19 Jan of "Guigo Grassus Dalphinus primus et monachus" but comments that it was erected long after his death. 1
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