The Bishops of _Aquileia_ and _Millain_ created one another, and therefore were of equal authority, and alike subject to the See of _Rome_. Pope _Pelagius_ about the year 557, testified this in the following words: [7] _Mos antiquus fuit_, saith he, _ut quia pro longinquitate vel difficultate itineris, ab Apostolico illis onerosum fuerit ordinari, ipsi se invicem Mediolanensis & Aquileiensis ordinare Episcopos debuissent_. These words imply that the ordination of these two Bishops belonged to the See of _Rome_. When _Laurentius_ Bishop of _Millain_ had excommunicated _Magnus_, one of his Presbyters, and was dead, [8] _Gregory_ the great absolved _Magnus_, and sent the _Pallium_ to the new elected Bishop _Constantius_; whom the next year [9] he reprehended of partiality in judging _Fortunatus_, and commanded him to send _Fortunatus_ to _Rome_ to be judged there: four years after [10] he appointed the Bishops of _Millain_ and _Ravenna_ to hear the cause of one _Maximus_; and two years after, viz. A.C. 601, when _Constantius_ was dead, and the people of _Millain_ had elected _Deusdedit_ his successor, and the _Lombards_ had elected another, [11] _Gregory_ wrote to the Notary, Clergy, and People of _Millain_, that by the authority of his Letters _Deusdedit_ should be ordained, and that he whom the _Lombards_ had ordained was an unworthy successor of _Ambrose_: whence I gather, that the Church of _Millain_ had continued in this state of subordination to the See of _Rome_ ever since the days of _Ambrose_; for _Ambrose_ himself acknowledged the authority of that See. _Ecclesia Romana_, [12] saith he, _hanc consuetudinem non habet, cujus typum in omnibus sequimur, & formam_. And a little after: _In omnibus cupio sequi Ecclesiam Romanam_. And in his Commentary upon 1 _Tim_. iii. _Cum totus mundus Dei sit, tamen domus ejus Ecclesia dicitur, cujus hodie rector est Damasus_. In his Oration on the death of his brother _Satyrus_, he relates how his brother coming to a certain city of _Sardinia_, _advocavit Episcopum loci, percontatusque est ex eo utrum cum Episcopis Catholicis hoc est cum Romana Ecclesia conveniret?_ And in conjunction with the Synod of _Aquileia_ A.C. 381, in a synodical Epistle to the Emperor _Gratian_, he saith: _Totius orbis Romani caput Romanam Ecclesiam, atque illam sacrosanctam Apostolorum fidem, ne turbari sineret, obsecranda fuit clementia vestra; inde enim in omnes venerandae communionis jura dimanant_. The Churches therefore of _Aquileia_ and _Millain_ were subject to the See of _Rome_ from the days of the Emperor _Gratian_. _Auxentius_ the predecessor of _Ambrose_ was not subject to the see of _Rome_, and consequently the subjection of the Church of _Millain_ began in _Ambrose_. This Diocese of _Millain_ contained _Liguria_ with _Insubria_, the _Alpes Cottiae_ and _Rhaetia_; and was divided from the Diocese of _Aquileia_ by the river _Addua_. In the year 844, the Bishop of _Millain_ broke off from the