Epistolae Decretales summorum pontificum,
Catholic Church.Pope (1227-1241 : Gregory IX)
GregoryIX,Pope,approximately 1170-1241.
Parisiis, apud Iacobum Puteanum ...
1570.
Colophon: Excudebat Christophorus Plantinus Antuerpiae, XV. Kal. Octob. An. M.D.LXIX.
Adams
Corpus juris canonici.
Canon law.