See, e.g. Lutheran–Orthodox Joint Commission, Seventh Meeting, The Ecumenical Councils, Common Statement, 1993, available atLutheran–Orthodox Joint Commission (B. I. 5a. "We agree on the doctrine of God, the Holy Trinity, as formulated by the Ecumenical Councils of Nicaea and Constantinople and on the doctrine of the person of Christ as formulated by the first four Ecumenical Councils.").
Hefele, Conciliengeschichte, vol. II, pp. 911–927. (For an equitable appreciation of the conduct of Vigilius see, besides the article VIGILIUS, the judgment of Bois, in Diet. de theol. cath., II, 1238–39.)