His name is mainly connected with the quarrel between Philip IV and Pope Boniface VIII.
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By the aid of a Florentine spy, Nogaret gathered a band of adventurers and of enemies of the Gaetani (Boniface's family) in the Apennines.
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The great Colonna house, at bitter feud with the Gaetani, was his strongest ally, and Sciarra Colonna accompanied Nogaret to Anagni, Boniface's birthplace.
Sciarrillo Colonna and Guillaume de Nogaret (lawyer and royal advisor of Philip IV) were to arrest the pope and bring him to France to stand trial, but this attempt failed.
On 7 September 1303, the king's advisor Guillaume de Nogaret led a band of two thousand mercenaries on horse and foot.
Guillaume Apollinaire | Guillaume Dufay | Guillaume Brahimi | Guillaume de Machaut | Guillaume-Chrétien de Lamoignon de Malesherbes | Robert Guillaume | Guillaume | Toussaint-Guillaume Picquet de la Motte | Guillaume Thomas François Raynal | Guillaume Lejean | Arnaud Guillaume de Barbazan | Alfred Guillaume Gabriel, Count D'Orsay | Pierre Guillaume | Louis Augustin Guillaume Bosc | Jean Guillaume Bruguière | Jean Guillaume Audinet-Serville | Jean-Baptiste Claude Eugène Guillaume | Guillaume Groen van Prinsterer | Guillaume Grandidier | Guillaume Dupuytren | Guillaume Dubois | Guillaume du Bellay | Guillaume Depardieu | Guillaume de Nogaret | Guillaume Dasquié | Guillaume Couillard | Guillaume Canet | Guillaume Bigot | Guillaume-Antoine Olivier | Bois-Guillaume |