Lambert of Auxerre was a medieval 13th century logician best known for writing the book "Summa Lamberti" or simply "Logica" [1] in the mid 1250s which became an authoritative textbook on logic in the Western tradition.
His contemporaries were Peter of Spain, William of Sherwood, and Roger Bacon.
[3] "Lambert of Auxerre" entry by Sara L. Uckelman in the Stanford Encyclopedia of Philosophy
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