SIGERIUS OF COURTRAI. - Master in the Faculty of Arts at Paris in 1309; then doctor of theology in 1315 and procurator of the Sorbonne; d. 30 May 1341, bequeathing to the Sorbonne eight volumes containing writings of St Thomas.
His name is associated with several short treatises on formal logic, the Ars Priorum, Summa modorum significandi, and a series of Fallaciae and Sophismata—subjects that sharpened the wits of young students preparing to undertake the study of natural philosophy. This investigation into the “modes of signifying,” widely diffused at the beginning of the fourteenth century, aimed to uncover the common logical structure of the grammars proper to every language; yet it fell into disrepute with the rise of the new terminist logic.