Theoremata de esse et essentia

The Theoremata de esse et essentia ("Essays on Being and Essence") is a work by Giles of Rome, a Scholastic theologian and philosopher who lived in the 13th century. In this work, Giles defended the Thomistic doctrine of substance. He supported the philosophical views of St. Thomas Aquinas, whose teachings he defended against ecclesiastical condemnation. Giles's support for Thomistic doctrines led to opposition from other theologians, forcing him to leave Paris temporarily. He later returned to teach theology at the University of Paris and became a significant intellectual leader within the Order of the Hermit Friars of St. Augustine.1