Decretals of Gregory IX

Jus novum (c. 1140-1563) Jus novissimum (c. 1563-1918) Jus codicis (1918-present) Other Sacraments Sacramentals Sacred places Sacred times Supra-diocesan/eparchal structures Particular churches Juridic persons Philosophy, theology, and fundamental theory of Catholic canon law Clerics Office Juridic and physical persons Associations of the faithful Pars dynamica (trial procedure) Canonization Election of the Roman Pontiff Academic degrees Journals and Professional Societies Faculties of canon law Canonists Institute of consecrated life Society of apostolic life The Decretals of Gregory IX (Latin: Decretales Gregorii IX), also collectively called the Liber extra, are a source of medieval Catholic canon law.

[1] Pope Gregory IX's work involved the compilation of documents from former collections, modifying some decisions whilst discarding others.

The new compilation bore no special title, but was called "Decretales Gregorii IX" or sometimes "Compilatio sexta", i. e. the sixth collection with reference to the "Quinque compilationes antiquæ".

In this peculiar case it is not possible to overcome the difficulty by recourse to the principle that a law of later date abrogates that of an earlier period.

Some authors (Schulte, Launin) maintain that Gregory IX abrogated even those laws prior to Gratian's time that the latter had not included in his "Decretum", but others contest this opinion.

At a later date some extracts were added to the "Glossa ordinaria" from the "Novella sive commentarius in decretales epistolas Gregorii IX" by Giovanni d'Andrea (Johannes Andreæ).

Among the numerous editions that followed, special mention must be made of that published in 1582 (in dibus populi romani) by order of Gregory XIII.

Among the modern commentators, Manuel Gonzalez Tellez and Fagnanus may be consulted advantageously for the interpretation of the text of the Decretals.