This council opened on 19 June in the presence of the emperor, but it is uncertain who presided over the sessions. In the extant lists of bishops present, Ossius of Cordova, and the presbyters Vitus and Vincentius are listed before the other names, but it is more likely that Eustathius of Antioch or Alexander of Alexandria presided. (see Decrees of the Ecumenical Councils, ed. Norman P. Tanner S.J.)
The bold text in the profession of faith of the 318 fathers constitutes, according to Tanner "The additions made by the council to an underlying form of the creed", and that the underlying creed was most likely "derived from the baptismal formula of Caesarea put forward by the bishop of that city Eusebius" or that it "developed from an original form which existed in Jerusalem or at any rate Palestine". "A direct descent from the creed of Eusebius of Caesarea is manifestly out of the question." Vol 1, p2)
The figure of 318 given in the heading below is from Hilary of Poitier and is the traditional one. Other numbers are Eusebius 250, Eustathius of Antioch 270., Athanasius about 300, Gelasius of Cyzicus at more than 300.
THE PROFESSION OF FAITH OF THE 318 FATHERS
Dokumen Konsili Vatican II
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