Canon LXXIX.
Canons of Local Councils Received in Trullo (Sardica, Carthage) · The Seven Holy Ecumenical Councils
It was further decreed that as often as clergymen convicted and confessed of any crime either on account of eorum, quorum verecundiæ parcitur, or on account of the opprobrium to the Church, and of the insolent glorying of heretics and Gentiles, if perchance they are willing to be present at their cause and to assert their innocence, let them do so within one year of their excommunication; if in truth they neglect during a year to purge their cause, their voice shall not be heard afterwards.
LocalT 2.83.3
When a cleric has been convicted of a crime, if he says his cause should be heard upon appeal, let the appeal be made within a year; after that the appeal shall not be admitted.
LocalT 2.83.6