Pope Gregory XIII wrote the preface for the publication and had published in 1583 A.D., the Corpus Iuris Canonici, which teaches in Decreti Prima Pars [Decretals of Gratian], Distinctio LX, Caput VI: “Because he [the pope] himself is judge of all, who is judged by none, unless perhaps he is discovered to have deviated from the faith. [...quia cunctos ipse judicaturus, à nemine est judicandus, nisi fortè deprehendatur à fide devius:...]”