The Vita S. Willelmi records that “beatus Willelmus” was born during the reign of King Pepin to “consule Theoderico…mater…comitissa…Aldana”.
Comte de Toulouse, Marquis de Septimania. The Vita Hludowici Imperatoris records that "Willelmus primus, signifier Hadhemarus" fought the Saracens in Córdoba [in 801], although it is not certain that "Willelmus primus" refers to Guillaume Comte de Toulouse.
He founded the Abbey of Gellone in 804, becoming a monk there in 806. "Willelmus…comes" names "genitore meo Theuderico et genitrice mea Aldana" and "fratribus meis Theudoino et Adalelmo" (version two: "fratre meo Teodoino et Teoderico et Adalelmo") "sororibus meis Albana et Bertana" "filiabus meis et filiis Barnardo, Witchario, Gotcelmo, Helimbruch" (version two: "filios meos et filias Witcario, Hildehelmo et Helinbruch") "uxoribus meis Cunegunde et Guitburge" (version two: "Witburg et Cunegunde") "nepote meo Bertranno" in his charter dated 14 Dec 804 (version two: dated 15 Dec 804) for the foundation of the monastery of Gellone. The Manual of Dhuoda names (in order) "Willelmus, Chungundis, Gariberga, Vuithbergis, Teddericus, Gothzelmus, Guarnarius, Rothlindis" as relatives of Bernard, husband of Doda, implying that all were deceased at the date the manual was written (843).
Canonised 1066. 1