 Ramon Llull (1232–1316) is an amazing figure in the field of philosophy during the Middle Ages. He is currently recognized as the author of Ars Magna, a combining logical system to discover the truth, conceived as an instrument to be used in interfaith dialogue to convert infidels. In the Ars Llull’s theological, metaphysical, and logical conceptions are amply illustrated, and they were developed throughout his more than 200 written works in Catalan, Arabic, and Latin. He is known for being among the first authors to use his vernacular language, Catalan, to communicate his thought.