āFor to this church [ROME] on account of her more powerful principality it is necessary that every church should agree (or come together), that is the faithful from everywhere, in which, always, that which is the tradition from the Apostles has been preserved by those who are from everywhere.ā Irenaeus
Communion with the See of Peter was considered necessary for inclusion in the Most Holy Catholic Church.
āWhy! a ^^^^^ that is cut off from the vine retains its shape. But what use is that shape, if it is not living from the root? come, brothers, if you wish to be engrafted in the vine. It is grievous when we see you thus lying cut off. Number the priests (i.e., bishops) even from the see of Peter itself. And in that order of fathers see who to whom succeeded: that is the rock which the proud gates of hades do not conquer.ā Augustine
Augustine states that the papacy was one of the things which kept him in the bosom of the Catholic Church.
āThere are many things which rightly keep me in the bosom of the Catholic Church. The consent of peoples and nations keeps me, her authority keeps me, inaugurated by miracles, nourished in hope, enlarged by love, and established by age. The succession of priests keeps me, from the very see of the Apostle Peter (to whom the Lord after His resurrection gave charge to feed his sheep) down to the present episcopate.ā
Leos Tomb is but another point.
Church militant is still militant is all I see and its noticed.
āCOMMUNIONā of the Church tis required. Unless we would like to also call this āancientā thinking?