From Monachos.net
Since after judgment had been delivered concerning him, there was need that all should agree in the right faith (for which purpose the most pious emperor had with the greatest pains assembled the holy Synod) with prayer and tears, your holiness being present with us in spirit and co-operating with us through those most God-beloved men whom you had sent to us, having as our protector the most holy and most comely Martyr Euphemia, we gave ourselves up entirely to this salutary work, all other matters being laid aside. And when the crisis demanded that all the most holy bishops gathered together should set forth an unanimous definition (sumfwnon oron) for the explanation and clearer understanding of our confession of our Lord Jesus Christ, our Lord God was found appearing to them that sought him not, and even to them that asked not for him. And although some from the beginning contentiously made opposition, he shewed forth nevertheless his truth and so disposed flyings that an unanimous and uncontradicted writing was published by us all, which confirmed the souls of the stable, and inviting to the way of truth all who had declined therefrom. And when we had subscribed with unanimous consent. the chart, we all with one consent, that is our whole synod, entered the martyry of the most holy and triumphant martyr Euphemia, and when at the prayer of our most pious and beloved of Christ Emperor Marcian, and of our most pious and in all respects faithful Empress, our daughter and Augusta Pulcheria, with joy, and hilarity we placed upon the holy altar the decision which we had written for the confirmation of the faith of our fathers in accordance with that holy letter you sent us; and then handed it to their piety, that they might receive it as they had asked for it. And when they had received it they gave glory with us to Christ the Lord, who had driven away the darkness of wicked opinion, and had illustrated with the greatest unanimity the word of truth, etc.
From this passage can easily be understood the very obscure passage in the letter of the Council to Leo, where it says that the definition was delivered by St. Euphemia as her own confession of faith. Vide note of the Ballerini on this epistle of Anatolius.
[Text found in Epistle to St. Leo. Migne, Patrologia Latina, Tom. LIV. col. 978.]