812), also known as Guillaume Fierabrace, St Guillaume de Gellone, and the Marquis au court nez, was the central figure of the southern cycle of French romance, called by the trouveres the geste of Garin de Monglane.
The cycle of twenty or more chansons which form the geste of Guillaume reposes on the traditions of the Arab invasions of the south of France, from the battle of Poitiers (732) under Charles Martel onwards, and on the French conquest of Catalonia from the Saracens.
The central fact of the geste of Guillaume is the battle of the Archamp or Aliscans, in which perished Guillaume's heroic nephew, Vezian or Vivien, a second Roland.
This event is related in a Norman-French transcript of an old French chanson de geste, the Chancun de Willame - which only was brought to light in 1901 at the sale of the books of Sir Henry Hope Edwardes - in the Covenant Vivien, a recension of an older French chanson and in Aliscans.
The chansons de geste of the cycle of Guillaume are: Enfances Garin de Monglane (15th century) and Garin de Monglane (13th century), on which is founded the prose romance of Guerin de Monglane, printed in the 15th century by Jehan Trepperel and often later; Girars de Viane (13th century, by Bertrand de Barsur-Aube), ed.