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Guillaume Boitel, was a knight and the faithful companion of the French knight Bertrand Du Guesclin. He wasoriginally sent by king Charles V of France to assist Du Guesclinduring the Anglo-French war in Normandy and theBreton War of Succession between Charles de Blois and Jean de Montfort (1363-1364).
He followed Du Guesclin as his vangard chief in Spain, helping Henry II of Castile against his half-brother Peter of Castile, withBreton, French and English warlords such as Hugh Calveley. He conquered Magallón and Briviesca.
He was one of the French chiefs during the Battle of Montiel. In 1369, after the Spanish civil war, he returned to France some months before Du Guesclin, appointed as constable of France in March 1370, for new fights against the troops of king Edward III of England.