Abstract

Two persons have been proposed as the author of the Summa Lamberti, a thireenth-century treatise on logic. Franco Alessio takes him to be the Auxerre Dominican Lambert of Ligny-le-Châtel, and he basis his claim on Dominican sources from the fourteenth to the nineteenth centuries. Recently, Alain de Libera has presented a counter-proposal: the author was Lambert of Lagny, a secular cleric at the time of the composition, who afterwards became a Dominican. This claim is based on the acta of the counts of Champagne and a document of Pope Urban IV. I conclude that, given the present evidence, de Libera’s case rests on more historically sound data, but that to arrive at this conclusion one must impeach the Dominican sources (not done by de Libera) and take into consideration additional data from the research of Michèle Mulchahey on the introduction of logic into the Dominican curriculum