The evidence of this is in a modernized extract quoted by the Liège herald, Louis Abry (1643–1720), from the lost fourth book of the "Myreur des Hystors" of Johans des Preis, styled d'Oultremouse. In this, "Jean de Bourgogne, dit a la Barbe" is said to have revealed himself on his deathbed to d'Oultremouse, whom he made his executor, and to have described himself in his will as "messire Jean de Mandeville, chevalier, comte de Montfort en Angleterre et seigneur de l'isle de Campdi et du château Pérouse (Lord Jean de Mandeville, knight, Count de Montfort in England and lord of the Isle of Campdi and the castle Pérouse)".