Oh! I know! I know!
Antioch!
THE WORK OF ST. OPTATUS BISHOP OF MILEVIS AGAINST THE DONATISTS
…You cannot then deny that you do know that upon Peter first in the City of Rome was bestowed the Episcopal Cathedra on which sat Peter, the Head of all the Apostles (for which reason he was called Cephas ,
1 St. Cyprian was the first Father to use the term Cathedra (Chair). He applied it (as a word in common use at the time) to the See of Rome which he termed the Cathedra Petri. Parmenian, evidently, had claimed the Cathedra, stating that it belonged to him through the Angelus or Bishop (in other words We have valid Orders, and therefore we are in the Church ). St. Optatus replies to this in the text by making direct appeal to Rome. No man can possess a Cathedra, argues Optatus, who is not in communion with the one Cathedra, which, in all but successive sentences, he calls una Cathedra, singularis Cathedra and Cathedra unica. …
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Evidently St. Optatus had no fear that any objection should be taken to what he was about to urge, as to something new. On the contrary, it was well known and recognised by all. You cannot deny that you do know. Petro primo. This in answer to who it was who first sat on the Cathedra . The answer is Peter. in urbe Roma. This in answer to the question where was he the first to sit (ubi ?). The answer is Rome. 3 Cathedram episcopalem esse conlatam. Evidently this is an instance of paronomasia or play upon words (Cephas from Kea-f)). It is so atrocious etym logically to derive an Aramaic from a Greek word that Balduinus thinks that that, in this one Cathedra, unity should be preserved by all, lest the other Apostles might claim each for himself separate Cathedras, so that he who should set up a second Cathedra against the unique Cathedra would already be a schismatic and a sinner. …
This is the doctrine so often and so clearly expressed by St. Cyprian, cf. e.g. Una ecclesia a Christo Domino nostro super Petrum, origine unitatis et ratione fundata (Ep. Ixx, 3), and Petro primum Dominus, super quern aedificavit Ecclesiam, et unde unitatis originem instituit et ostendit, potestatem istam dedit (Ep. Ixxiii, 3), and Deus unus est et Christus unus, et una Ecclesia, et Cathedra una, super Petrum Domini voce fundata (xliii, 5) . We should always bear in mind that St. Cyprian was at this time the great authority in Christian Africa, not only in the eyes of Catholics, but also in those of Donatists.
peace