Jean d'Outremeuse

It combines Vincent de Beauvais's early works Ogier le Danois and the Geste de Liège into a universal history, from the fall of Troy to 1340, mixing real and legendary events.

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.

And 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 November 17, 1372: this inscription is quoted as far back as 1462.

Tresorier de philosophie naturelle des pierres precieuses (a lapidary) This book is a compilation of recipes for making fake gems by coloring glasses by various means.

It is of interest to glassworkers or historians seeking to understand the manufacture of ancient glass or fake gems adorning various pieces of goldsmith's work.