He was a student of Godfrey of Fontaines, and teacher of John Baconthorpe. He became prior-general of the Carmelites in 1318, bishop of Mallorca, and bishop of Elna. As bishop of Elna he opposed Adhémar IV de Mosset.
He was an early infallibilist; the concept of papal infallibility is thought to occur first in a work he wrote concerning the conflict of Pope John XXII (1316–34) and the Franciscan Spirituals. It is said that he adapted this doctrine to papal needs, rather than originating it, and before 1328.
He was a leading member of a small group of infallibilists at the court of Pope John XXII. His position on papal infallibility "so closely anticipated the doctrine of Vatican I that in the judgment of B.M. Xiberta, the Carmelite scholar who edited [Terreni's] work, 'if he had written it after Vatican I he would have to add or change hardly a single word.'" He wrote: "We are not asking whether a pope can be a heretic in himself but whether he can err in defining anything in the church and obliging the faithful to believe, so that his error does not concern the person of the pope alone but concerns all the faithful and the whole church of Christ. For an error concerning his person can inhere in the pope, but not an error concerning the whole church."
He was one of those opposing the views of Arnold of Villanova on the Antichrist; and he first dubbed Joachim of Fiore a heretic. He was asked, with Pierre de la Palud, to report on Peter John Olivi's apocalyptic writing.
Guido was buried in the Carmelite church in Avignon.
- A. Fidora, Guido Terreni, O. Carm. (†1342). Studies and Texts (= Textes et études du moyen age, 78), Turnhout: Brepols Publishers, 2015, ISBN 978-2-503-55528-7
- Guiu Terreni, Confutatio errorum quorundam magistrorum, ed. Alexander Fidora, Almudena Blasco and Celia López Alcalde, Barcelona: Obrador edéndum, 2014.
- B.-M. Xiberta, Guiu Terrena, Carmelita de Perpinyà, (Barcelona 1932)
- Jorge J.E. Gracia, The Convertibility of Unum and Ens According to Guido Terrena, Franciscan Studies, 33, 1973, pp. 143–170
- T. Shogimen, William of Ockham and Guido Terreni, History of Political Thought, 19, 4, 1998, pp. 517–530
- C. Schabel, Early Carmelites between Giants. Questions on Future Contingents by Gerard of Bologna and Guy Terrena. Recherches de Théologie et Philosophie Médiévales 70 (2003) 139-205.
- Jorge J. E. Gracia, Timothy B. Noone (editors), A Companion to Philosophy in the Middle Ages (2003), p. 291.
- Daniel Williman, The Right of Spoil of the Popes of Avignon, 1316-1415 (1988), p. 121.
- http://symploke.trujaman.org/index.php?title=Guido_de_Terrena, in Spanish, http://web.archive.org/web/20091026220045/http://www.geocities.com/Athens/Atlantis/2572/ObispadoElna.htm
- http://pagesperso-orange.fr/jean.pares/seigneur/mosset/21mosset.htm, in French.
- Andrew Jotischky, The Carmelites and Antiquity: Mendicants and Their Pasts in the Middle Ages (2002), p. 26.
- Jaroslav Pelikan, The Christian Tradition: A History of the Development of Doctrine (1989), p. 107.
- Philippe Levillain,The Papacy: An Encyclopedia (2002), p. 776.
- Paul Misner, Papacy and Development: Newman and the Primacy of the Pope (1976), note p. 176.
- Brian Gogan, The Common Corps of Christendom (1982), note p. 32.
- Thomas Turley, "Infallibilists in the Curia of Pope John XXII" (Journal of Medieval History (April 1975), 1 (1), pp. 71-101 (Abstract)
- Mark E. Powell, Papal Infallibility: A Protestant Evaluation of an Ecumenical Issue (Eerdmans 2009 ISBN 978-0-8028-6284-6), p. 34
- Brian Tierney, Origins of papal infallibility, 1150-1350 (Brill 1972), p. 249
- Marjorie Reeves, The Influence of Prophecy in the Later Middle Ages: A Study in Joachimism (1969), p. 315.
- John Anthony Burrow, Ian P. Wei, Medieval Futures: Attitudes to the Future in the Middle Ages (2000), p. 34.
- Reeves, p. 69.
- From black magic to heresy: a doctrinal leap in the pontificate of John XXII. Industry & Business Article - Research, News, Information, Contacts, Divisions, Subsidiaries, Business Associations
- Gordon Leff, Heresy in the Later Middle Ages, p. 211.
- Joseph Puig, p. 2560 in Andreas Speer, Wissen über Grenzen: Arabisches wissen und lateinisches Mittelalter (2006).
- Sebastiano Fantoni Castrucci, Istoria della Città d'Avignone e del Contado Venesino (Venice 1678), vol. 1, p. 59