The Council of Chalcedon (451 AD)

The holy and great and ecumenical Synod, which by the grace of God according to the constitution of our most pious and beloved of God emperors assembled together at Chalcedon the city of Bithynia, in the martyry of the most holy and victorious Martyr Euphemia to Dioscorus.

We do you to wit that on the thirteenth day of the month of October you were deposed from the episcopate and made a stranger to all ecclesiastical order (θεσμοῦ) by the holy and ecumenical synod, on account of your disregard of the divine canons, and of your disobedience to this holy and ecumenical synod and on account of the other crimes of which you have been found guilty, for even when called to answer your accusers three times by this holy and great synod according to the divine canons you did not come.