Council of Aquileia, 381
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The council was held in September 381 AD and summoned by Gratian, the Western Roman Emperor, explicitly to "solve the contradictions of discordant teaching" was in fact organized by Ambrose, though it was presided over by Valerian, Bishop of Aquileia. The council was attended by thirty-two bishops of the West, from Italy, Africa, Gaul and Illyria, among them St Philastrius of Brescia and St Justus of Lyons, deposed from their offices two bishops of the Eastern province of Dacia, Palladius of Ratiaria and Secundianus of Singidunum, as partisans of Arius.
Palladius had applied to the Emperor of the East for an opportunity to clear himself before a general council of these charges concerning the nature of Christ and was unwilling to submit to a council of the Western bishops only, for Ambrose had previously assured the Emperor of the West that such a matter as the soundness or heresy of just two bishops might be settled by a council simply consisting of the bishops of the Diocese of Italy alone. Politics and Christology were inextricably entangled in the 4th century: "You have contrived, as appears by the sacred document (Gratian's amended convocation) which you have brought forward, that this should not be a full and General Council: in the absence of our Colleagues we cannot answer", was Palladius' stand.
Ambrose proposed that Arius' letter from Nicomedia to Alexander, bishop of Alexandria, should be read in detail, and Palladius be called upon to defend or condemn each heretical proposition that disputed Catholic orthodoxy. Arius had said that the Father alone is eternal; the Catholics insisted that the Son was co-eternal. Palladius quoted Scripture, which Ambrose skirted. Ambrose rested upon the verbal formulas recently agreed upon by authority of the Church, while Palladius refused to admit the legitimacy of the proceedings. The other bishops unanimously pronounced anathema on all counts, and the matter was settled. The surviving partial transcript of the proceedings reveal the character of Ambrose and the manner and technique of his argument. Of Palladius it is said by Vigilius, a late 5th century bishop of Thapsus in Africa, that after Ambrose's death (397) he wrote a reply to Ambrose's writings against Arianism, which Vigilius in turn wrote to counter.
This council also requested the Emperors Theodosius and Gratian to convene at Alexandria a general council of all bishops in order to put an end to the Meletian schism at Antioch that had been ongoing since 362.
- Proceedings of the council, among the letters of Ambrose
- Herbermann, Charles, ed. (1913). "Councils of Aquileia". Catholic Encyclopedia. New York: Robert Appleton Company.
Scolies Ariennes sur le Concile d'Aquilee, introduction, text, and notes Roger Gryson, Sources chretiennes 267 (Paris: Cerf, 1980).
Neil B. McLynn, Ambrose of Milan: Church and Court in a Christian Capital (Berkeley: U California Press, 1994).