The History of Don Quixote, Volume 2, Part 34

The duke and duchess resolved that the challenge Don Quixote had, for the reason already mentioned, given their vassal, should be proceeded with; and as the young man was in Flanders, whither he had fled to escape having Dona Rodriguez for a mother-in-law, they arranged to substitute for him a Gascon lacquey, named Tosilos, first of all carefully instructing him in all he had to do. Two days later the duke told Don Quixote that in four days from that time his opponent would present himself on the field of battle armed as a knight, and would maintain that the damsel lied by half a beard, nay a whole beard, if she affirmed that he had given her a promise of marriage.