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Peter Lombard or Petrus Lombardus; (c. 1100–July 20, 1160 in Paris) was a scholastic theologian and bishop and author of Four Books of Sentences, which became the standard textbook of theology, for which he is also known as Magister Sententiarum.

Peter Lombard was born in Lumellogno,^[1] now a quartiere of Novara, Lombardy, to a poor family on the dole.^{[citation needed]} His date of birth was likely between 1095 and 1100.

His education most likely began in Italy at the cathedral schools of Novara and Lucca. The patronage of Otto, bishop of Lucca, who recommended him to Bernard of Clairvaux, allowed him to leave Italy and further his studies at Reims and Paris. Petrus Lombardus studied first in the cathedral school at Reims, where Magister Alberich and Lutolph of Novara were teaching, and arrived in Paris about 1134^[2], where Bernard recommended him^[3] to the canons of the church of St-Victor. In Paris, where he spent the next decade teaching at the cathedral school of Notre Dame, he came into contact with Peter Abelard and Hugh of St. Victor, who were among the leading theologians of the time. There are no proven facts relating to his whereabouts in Paris until 1142 when he became recognized as writer and teacher. Around 1145, Peter became a "magister", or professor, at the cathedral school of Notre Dame in Paris. Peter's means of earning a living before he began to derive income as a teacher and from his canon's prebend is shrouded in uncertainty.

Lombard's dialectical style of teaching gained quick acknowledgment. It can be surmised that this attention is what prompted the canons of Notre Dame to ask him to join their ranks. He was considered a celebrated theologian by 1144. The Parisian school of canons had not included among their number a theologian of high regard for some years. The canons of Notre Dame, to a man, were members of the Capetian dynasty, relatives of families closely aligned to the Capetians by blood or marriage, scions of the Ile-de-France or eastern Loire Valley nobility, or relatives of royal officials. In contrast, Peter had no relatives, ecclesiastical connections, and no political patrons in France. It seems that he must have been invited by the canons of Notre Dame solely for his academic merit.

He became a subdeacon in 1147, and was ordained priest some time before 1156. At the Council of Reims (1148)^[4] and possibly at the consistory of Paris the year before, he took part as a theological expert. At some time after 1150 he became a deacon, then an archdeacon by 1156, or maybe as early as 1152. In 1159, he was named bishop of Paris: a hostile witness, Walter of St Victor accused Peter of obtaining the office by simony,^[5] though he had no sources of income; the more usual story is that Philip, younger brother of Louis VII. and archdeacon of Notre-Dame was elected by the canons but declined in favor of Peter, his teacher. Peter was consecrated at the feast of SS. Peter and Paul, 28 July 1159.

His reign as bishop was brief.^[6] He died on either July 21 or 22, 1160. Little can be ascertained about Lombard's administrative style or objectives because he left behind so few episcopal acta. He was succeeded by Maurice de Sully, the builder of the Cathedral of Notre Dame.^[7] His tomb in the church of Saint-Marcel in Paris was destroyed during the French Revolution, but a transcription of his epitaph survives.

Peter Lombard wrote commentaries on the Psalms and the Pauline epistles; however, his most famous work by far was Libri Quatuor Sententiarum, or the Four Books of Sentences, which became the standard textbook of theology at the medieval universities. From the 1220s until the 16th century, no work of Christian literature, except for the Bible itself, was commented upon more frequently. All the major medieval thinkers, from Albert the Great and Thomas Aquinas to William of Ockham and Gabriel Biel, were influenced by it. Even the young Martin Luther still wrote glosses on the Sentences.

The Four Books of Sentences is a compilation of biblical texts, together with relevant passages from the Church Fathers and many medieval thinkers, on virtually the entire field of Christian theology as it was understood at the time. Lombard's magnum opus stands out as the first major effort to bring together commentaries on the full range of theological issues, arrange the material in a systematic order, and attempt to reconcile them where they appeared to defend different viewpoints. The Sentences starts with the Trinity in Book I, moves on to creation in Book II, treats Christ, the savior of the fallen creation, in Book III, and deals with the sacraments, which mediate Christ's grace, in Book IV.

Peter Lombard's most famous and most controversial doctrine in the Sentences was his identification of charity with the Holy Spirit in Book I, distinction 17. According to this doctrine, when the Christian loves God and neighbor, this love literally is God; he become divine and is taken up into the life of the Trinity. This idea was never declared unorthodox, but few theologians have been prepared to follow Peter Lombard in his audacious teaching. Compare Pope Benedict XVI's encyclical Deus Caritas Est, 2006.

Also in the Sentences was the doctrine that marriage was consensual (and need not be consummated to be considered perfect, unlike Gratian's analysis). Lombard's interpretation was later endorsed by Pope Alexander III, and had a significant impact on Church interpretation of marriage.

• Ludwig Hödl, in Biografish-Bibliografisches Kirchenlexikon: Petrus Lombardus
• "Peter Lombard Magister Sententiarum" Texts and further links.
  • Peter Lombard's Book of Sentences in parallel Latin English (Book I)

• Colish, Marcia L., Peter Lombard Volume One (New York: E.J. Brill, 1994).
• Rosemann, Philipp W. Peter Lombard (New York: Oxford University Press, 2004).
• Philipp W. Rosemann, The Story of a Great Medieval Book: Peter Lombard's "Sentences" (Peterborough, Ontario: Broadview Press, 2007).
• Herlihy, David Medieval Households (Cambridge: Harvard University Press, 1985).