| Bio-Bibliographical Guide to Medieval and Early Modern Jurists | 
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 | Report No. a389 | Principium decretalium ‘Quoniam tunc decens’ | post 1234 | 
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| Alternative Names | 
| Biography/Description | 
| An introduction to the Decretales Gregorii IX resembling that of Johannes De Deo. | 
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 | Entry by: KP rev AL 2015 | 
| Text(s) | 
| No. 1 | Principium decretalium ‘Quoniam tunc decens’. | 
| Text(s) – Manuscripts | 
| No. 1 | Principium decretalium ‘Quoniam tunc decens’. | 
| Manuscript | Wrocław, Bibl. Univ. I.Q.102, fol. 201v–202r (now lost) | 
| Literature | 
| K. Pennington, ‘The Making of a Decretal Collection: The Genesis of Compilatio tertia’, in Proceedings Salamanca (MIC C–6; Città del Vaticano 1980) 73–74. | 
| S. Kuttner, ‘Johannes Teutonicus, das vierte Laterankonzil und die Compilatio quarta’, in Miscellanea Giovanni Mercati, L. Donati, ed. (Studi e testi 125; Città del Vaticano 1946) 608–34. Reprinted in: idem, Medieval Councils, Decretals, and collections of Canon Law (London 1980) no. X, with ‘Retractationes’ 11. | 
