But the first decretal Epistle now extant is this of Siricius to Himerius; by which the Pope made Himerius his Vicar over all Spain for promulging his Decrees, and seeing them observed. The Bishop of Sevill was also the Pope’s Vicar sometimes; for Simplicius wrote thus to Zeno Bishop of that place: Talibus idcirco gloriantes indiciis, congruum duximus vicaria Sedis nostrae te auctoritate fulciri: cujus vigore munitus, Apostolicae institutionis Decreta, vel sanctorum terminos Patrum, nullatenus transcendi permittas. And Pope Hormisda made the Bishop of Sevill his Vicar over Boetica and Lusitania, and the Bishop of Tarraco his Vicar over all the rest of Spain, as appears by his Epistles to them.

Pope Innocent the first, in his decretal Epistle to Victricius Bishop of Rouen in France, A.C. 404, in pursuance of the Edict of Gratian, made this Decree: Si quae autem causae vel contentiones inter Clericos tam superioris ordinis quam etiam inferioris fuerint exortae; ut secundum Synodum Nicenam congregatis ejusdem Provinciae Episcopis jurgium terminetur: nec alicui liceat, Romanae Ecclesiae, cujus in omnibus causis debet reverentia custodiri, relictis his sacerdotibus, qui in eadem Provincia Dei Ecclesiam nutu Divino gubernant, ad alias convolare Provincias. Quod siquis forte praesumpserit; & ab officio Clericatus summotus, & injuriarum reus judicetur. Si autem majores causae in medium fuerint devolutae, ad Sedem Apostolicam sicut Synodus statuit, & beata consuetudo exigit, post judicium Episcopale referantur. By these Letters it seems to me that Gallia was now subject to the Pope, and had been so for some time, and that the Bishop of Rouen was then his vicar or one of them: for the Pope directs him to refer the greater causes to the See of Rome, according to custom. But the Bishop of Arles soon after became the Pope’s Vicar over all Gallia: for Pope Zosimus, A.C. 417, ordaining that none should have access to him without the credentials of his Vicars, conferred upon Patroclus the Bishop of Arles this authority over all Gallia, by the following Decree.