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Rupert was most likely born in or around Liège in the years 1075-1080, and there, as was the custom, was brought by his family as an oblate to the Benedictine abbey of Saint-Laurent in Liège, which already a generation earlier had become a notable centre of learning, including mathematics, hagiography, and poetry. There Rupert eventually made monastic profession and was educated under the capable Abbot, Berengar.
It 1092, in the context of the conflict between the papacy and the Empire, known as the Investiture Controversy, which in Germany encompassed nearly 50 years of civil war (1076-1122), Rupert joined other monks in following their abbot, Berengar, into exile in northern France, from where he returned in 1095. According to differing sources, around 1106 or 1109 he was ordained a priest by the Bishop of Liège, Otbert, a powerful figure, and a close supporter of Emperor Henry IV.
While the minor works of Rupert's youth seem to have largely perished, it was from shortly after his priestly ordination, about the year 1110, that he began producing an immense volume of surviving writings, which were widely known to his contemporaries, and though in some quarters they were not without influence, they also won him strong opposition.
At Deutz, Rupert emerged as a prominent theologian, and from surviving manuscripts, it would seem that he was a prolific writer, his works taking up four volumes in Patrologia Latina (vols. 167-170). These works demonstrate among other things his familiarity with the disciplines of the trivium and quadrivium of medieval education in the liberal arts and his acquaintance with the Scriptures.
The main works include:
De voluntate Dei
De omnipotentia Dei
Commentaria in Canticum canticorum
De divinis Officiis
De Victoria Verbi Dei
De Gloria et Honore Filii Hominis super Mattheum
De Trinitate et operibus eius, written around 1112-1116.
De glorificatione Trinitatis et processione Spiritus sancti, written in 1128.
Of these works, the most widely known was his De divinis officiis, which dealt with the liturgy and includes observations on plainchant. Other of his theological writings lead to his entering into controversy with Anselm of Laon and Anselm's disciple William of Champeaux, later to be the master of Peter Abelard. Other works, such as Rupert's De Trinitate, also incidentally offer treatments on music, and it is possible that at Liège he studied music under a monk called Heribrand. Rupert himself makes mention of a hymn he wrote to the Holy Spirit. Moreover, it is thought that in his youth he wrote others in honour of St Heribert, as also of St Mary Magdalene, St Goar and St Severinus.
His writings were later scrutinized in relation with the doctrine of impanation, a Eucharisticheresy from the point of view of the Catholic Church because, contrary to the dogma of transubstantiation wherein the substance (but not the appearances and physical characteristics) of the bread and wine is seen as being wholly converted into the substance of Christ's Body and Blood, united to his divine Person, impanation maintains that Christ directly unites the substance of the bread and wine to his divine person (or sometimes to his human nature), just as he united his own body and blood to his divine Person. They influenced the theology in particular of Honorius Augustodunensis and Gerhoch of Reichersberg.
^ On the life see J.-H. Van Engen, Rupert of Deutz, Los Angeles, Berkeley & London 1983; M.L. Arduini & H. Silvestre, 'La date de la naissance de Rupert et la date de son départ pour Siegburg', in Scriptorium 16 (1962) 345-348; H. Silvestre, 'Premières touches pour un portrait de Rupert de Liège ou de Deutz', in Clio et son regard: Mélanges J. Stiennon, Liège, 1982, pp. 579-596.
^ Abbot of Siegburg 1105-1126, Bishop of Regensburg 1126-1132, cf. J. Semmler, 'Die Klosterreform von Siegburg: Ihre Ausbreitung und ihr Reformprogramm im 11. und 12. Jahrhundert', in Rheinisches Archiv 53 (1959); M. Sinderhauf, 'Cuno I. (1070-1132) Abt von Siegburg und Bischof von Regensburg', in M. Mittler & W. Herborn (edd.), Temporibus tempora, Siegburg, 1995, pp. 1-126; R. Bauereiss, 'Honorius von Canterbury (Augustodunensis) and Kuno I. der Raitenbucher, Bischof von Regensburg 1126-1132', in Studien and Mitteilungen zur Geschichte des Benediktiner-Ordens 67 (1956) 306-313; R. Bauereiss, 'Regensburg als religiös-theologischer Mittelpunkt Süddeutschlands im XII. Jahrhundert', in L. Scheffczyk, W. Dettloff, & R. Heinzmann (edd.), Wahrheit und Verkündigung, München & Paderborn, 1967, II, p. 1143.
^ Cf. E. Wisplinghoff, Friederich I. Erzbischoff von Köln 1100-1131, Bonn 1951.
^ For his thought, cf. M. Magrassi, Teologia e storia nel pensiero di Ruperto di Deutz, Roma 1959; W. Beinert, Die Kirche-Gottes Heil in der Welt. Die Lehre von der Kirche nach den Schriften des Rupert von Deutz, Honorius Augustodunensis und Gerhoch von Reichersberg. Ein Beitrag zur Ekklesiologie des 12. Jahrhunderts, Münster 1974, pp. 12-37; ; Alessio Magoga, Linee di cristologia in Ruperto di Deutz, in La Scuola Cattolica 134 (2006) 73-104; Heinz Finger, Harald Horst, Rainer Klotz, Rupert von Deutz. Ein Denker zwischen den Zeiten?, Erzbischöfliche Diözesan- und Dombibliothek, Köln, 2009; Alessio Magoga, 'La teologia di Ruperto di Deutz', in I. Biffi & C. Marabelli (edd.), Il mondo delle scuole monastiche. XII secolo, Jaca Book, Milano & Città Nuova, Roma, 2010, pp. 79-135.
Anton Leichtfried, Trinitätstheologie als Geschichtstheologie. 'De sancta Trinitate et operibus eius' Ruperts von Deutz, Würzburg, 2002, pp. 10-75.
Alessio Magoga, Ruperto di Deutz, Mite e umile di cuore. I libri XII e XIII del 'De gloria et honore Filii hominis. Super Matthaeum', introduzione, traduzione e note, Glossa, Milano, 2004.
Alessio Magoga, 'Linee di cristologia in Ruperto di Deutz', in La Scuola Cattolica 134 (2006) 73-104.
Alessio Magoga, 'La teologia di Ruperto di Deutz', in I. Biffi & C. Marabelli (edd.), Il mondo delle scuole monastiche. XII secolo, Jaca Book, Milano & Città Nuova, Roma, 2010, pp. 79-135.
Hubert Silvestre, Rupert von Deutz, Köln, 1988 (= Rheinische Lebensbilder 11), pp. 7-35.
Editions of the Latin Text of the Works
De victoria verbi Dei, Anton Sorg, Augsburg, 1487.
R.D.D. Ruperti Abbatis Monasterij S. Heriberti Tuitiensis Ordinis D. Benedicti, Viri longe doctissimi, summiq[ue] inter veteres theologi, Opera, Quotquot hactenus haberi potuerunt, auctiora quam antea. Cum Duobus Indicibus: priore rerum et verborum posteriore locorum S. Scripturae,' Mylius, Moguntiae 1631. Digital reproduction.