John of St. Thomas | |
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| Born | João Poinsot 9 July 1589[1] Lisbon, Portugal |
| Died | 15 June 1644[1] Fraga, Spain |
| Occupation | Friar, philosopher, theologian |
| Education | University of Coimbra University of Louvain |
| Subject | Metaphysics, logic, epistemology, ethics, political philosophy, semiotics |
| Literary movement | Scholasticism, Thomism |
| Notable works | Tractatus de Signis |
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| Thomas Aquinas |
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John of St. Thomas, O.P., born João Poinsot (also called John Poinsot in English; 9 July 1589 – 15 June 1644), was a Portuguese Dominican friar, Thomist theologian, and professor of philosophy. He is known for being an early theorist in the field of semiotics.