It is added that, having had the misfortune to kill an unnamed count in his own country, he engaged himself to travel through the three parts of the world, arrived at Liège in 1343, was a great naturalist, profound philosopher and astrologer, and had a remarkable knowledge of physics. The identification is confirmed by the fact that in the now destroyed church of the Guillemins was a tombstone of Mandeville, with a Latin inscription stating that he was otherwise named "ad Barbam", was a professor of medicine, and died at Liège on 17 November 1372: this inscription is quoted as far back as 1462.