Province of Rome therefore comprehended Sicily, with so much of Italy and the neighbouring Islands as sent Bishops to the annual Councils of Rome; but extended not into the Provinces of Ravenna, Aquileia, Millain, Arles, &c. those Provinces having Councils of their own.  The Bishops in every Province of the Roman Empire were convened in Council by the Metropolitan or Bishop of the head city of the Province, and this Bishop presided in that Council:  but the Bishop of Rome did not only preside in his own Council of the Bishops of the suburbicarian regions, but also gave Orders to the Metropolitans of all the other Provinces in the Western Empire, as their universal governor; as may be further perceived by the following instances.

Pope Zosimus A.C. 417, cited Proculus Bishop of Marseilles to appear before a Council at Rome for illegitimate Ordinations; and condemned him, as he mentions in several of his Epistles.  Pope Boniface I. A.C. 419, upon a complaint of the Clergy of Valentia against Maximus a Bishop, summoned the Bishops of all Gallia and the seven Provinces to convene in a Council against him; and saith in his Epistle, that his Predecessors had done the like.  Pope Leo I. called a general Council of all the Provinces of Spain to meet in Gallaecia against the Manichees and Priscillianists, as he says in his decretal Epistle to Turribius a Spanish Bishop.  And in one of his decretal Epistles to Nicetas Bishop of Aquileia, he commands him to call a Council of the Bishops of that Province against the Pelagians, which might ratify all the Synodal Decrees which had been already ratified by the See of Rome against this heresy.  And in his decretal Epistle to Anastasius Bishop of Thessalonica, he ordained that Bishop should hold two Provincial Councils every year, and refer the harder causes to the See of Rome:  and if upon any extraordinary occasion it should be necessary to call a Council, he should not be troublesom to the Bishops under him, but content himself with two Bishops out of every Province, and not detain them above fifteen days.  In the same Epistle he describes the form of Church-Government then set up, to consist in a subordination of all the Churches to the See of Rome:  De qua forma, saith he, Episcoporum quoque est orta distinctio, & magna dispositione provisum est ne omnes sibi omnia vindicarent, sed essent in singulis Provinciis singuli quorum inter fratres haberetur prima sententia, & rursus quidam in majoribus urbibus constituti sollicitudinem sumerent ampliorem, per quos ad unam Petri Sedem universalis Ecclesiae cura conflueret, & nihil usque a suo capite dissideret.  Qui ergo scit se quibusdam esse praepositum, non moleste ferat aliquem sibi esse praepositum; sed obedientiam quam exigit etiam ipse dependat; et sicut non vult gravis oneris sarcinam ferre, ita non audeat aliis importabile pondus imponere.  These words sufficiently shew the monarchical form of government then set up in the Churches of the Western Empire under the Bishop of Rome, by means of the imperial Decree of Gratian, and the appeals and decretal Epistles grounded thereupon.