Decretals of Gregory IX
This term (Latin Extra 'outside' + vagari 'to wander') is employed to designate some papal decretals not contained in certain canonical collections which possess a special authority: they are not found in the Decree of Gratian or the three official collections of the "Corpus Juris" (the Decretals of Gregory IX, the Sixth Book of the Decretals and the Clementines).