John of St. Thomas, O.P., born João Poinsot, was a Portuguese Dominican friar, Thomist theologian, and professor of philosophy. He is known for being an early theorist in the field of semiotics. Wikipedia
Born: July 9, 1589, Lisbon, Portugal
Died: June 15, 1644 (age 54 years), Fraga, Spain
Notable works: Tractatus de Signis