Yvonetus a Dominican who was supposed to be the author of a tract of the 13th century, entitled Tractatus de Haeresi Pauperum de Lugdumio, and given in Martone and Durand's Thesaurus Novus Anecdot. volume 5, page 1777, of whom nothing else is known. Pfeiffer has proved that the tractate is the production of the Franciscan David of Augsburg early in the 13th century. Two manuscript copies. of the piece exist, at Stuttgart and Strasburg. See Pega, in Eymenricus, Directorium Inquisionum (Rome, 1587 fol.); page 229, 279; D'Argentre, Collectio Judiciorum de Novis Erroribus, 1:84, 95; Haupt, Zeifschr. fur Deutsch. Aterthim, 1853, page 55; Herzog, Real- Encyklop s.v.