that these had already been drawn up by the time of Marcus Aurelius or Commodus, as was certainly the case at Rome. (4) The notion of the apostolic succession of the episcopate[309] was first turned to account by the Roman bishops, and they were the first who definitely formulated the political idea of the Church in connection with this. The utterances and corresponding practical measures of Victor,[310] Calixtus (Hippolytus), and Stephen are the earliest of their kind; whilst the precision and assurance with which they substituted the political and clerical for the ideal conception of the Church, or amalgamated the two notions, as well as the decided way in which they proclaimed the sovereignty of the bishops, were not surpassed in the third century by Cyprian himself. (5) Rome was the first place, and that at a very early period, to date occurrences according to her bishops; and, even outside that city, churches reckoned, not according to their own, but according to the Roman episcopate.[311] (6) The Oriental Churches say that two bishops of Rome compiled the chief apostolic regulations for the organisation of the Church; and this is only partially wrong.[312] (7) The three great theologians of the age, Tertullian, Hippolytus, and Origen, opposed the pretensions of the Roman bishop Calixtus; and this very attitude of theirs testified that the advance in the political organisation of the Church, denoted by the measures of Calixtus, was still an unheard-of novelty, but immediately exercised a very important influence on the attitude of other Churches. We know that the other communities imitated this advance in the succeeding decades. (8) The institution of lower orders of clergy with the corresponding distinction of _clerici maiores_ and _minores_ first took place in Rome; but we know that this momentous arrangement gradually spread from that city to the rest of Christendom.[313] (9) The different Churches communicated with one another through the medium of Rome.[314] From these considerations we can scarcely doubt that the fundamental apostolic institutions and laws of Catholicism were framed in the same city that in other respects imposed its authority on the whole earth; and that it was the centre from which they spread, because the world had become accustomed to receive law and justice from Rome.[315] But it may be objected that the parallel development in other provinces and towns was spontaneous, though it everywhere came about at a somewhat later date. Nor do we intend to contest the assumption in this general sense; but, as I think, it can be proved that the Roman community had a direct and important share in the process and that, even in the second century, she was reckoned the first and most influential Church.[316] We shall give a bird's-eye view of the most important facts bearing on the question, in order to prove this.