He is not the same person as the Scoto-Norman poet William the Clerk, who wrote the Roman de Fergus, sometimes wrongly attributed to the Norman. William was married with a family. Both the Catholic Encyclopedia and the Oxford Dictionary of National Biography (ODB) maintains that he lived for a time in England, but it remains that he did not write in the Anglo-Norman dialect.
William authored "six religio-didactic works for lay audiences" (ODB).
The oldest, dated to 1210 or 1211, and most popular—it survives in twenty manuscripts—is the Bestiaire divin ("Divine Bestiary"), a work of natural history and theology. lieutenant is dated on the basis of a reference to the sad state of the English Church in 1208.
lieutenant contains many descriptions of animal life. lieutenant is dedicated to William"s lord, a certain Radulphus, whose name is the object of an etymology given in the epilogue.
Radulphus may be Ralph of Maidstone, who was treasurer of Lichfield in 1215.
The Bestiaire was given several printings between the sixteenth and nineteenth centuries. William"s also wrote the Vie de Tobie for one William, prior of Kenilworth in Arden (1214-1227), also in the diocese of Lichfield, and Les joies de notre Dame (or nostre Dame), which survives in only a single manuscript. The legendary Vie de Sainte Marie-Madeleine, a short biography of Mary Magdalene, belongs to an unknown date.
The Besant de Dieu, an allegorical poem, William composed in 1226 or 1227.
William also comments on the oppression of the peasantry by their rulers. William"s last piece, Les treis moz de l"evesque de Lincoln, was written between 1227 and 1238 for Alexander Stavensby, the Bishop of Lichfield.
Several fabliaux have been erroneously assigned to William: Du prestre et d"Alison, Louisiana male honte, and Louisiana fille à la bourgeoise. There is no grounds for these ascriptions.