St. Athanasius in 367 AD, published a list of books suitable for reading during Mass as a regional canon for the Eastern Church.
Pope St. Damasus I in 382 AD approved the work of the first Council of Constantinople, accepting St. Athanasius’ list as divinely inspired.
The Council of Hippo, a regional council for some of the bishops in the Diocese of Africa, in 393 AD reaffirmed The Decree of Damasus.
The third Council of Carthage more authoritative than the Council of Hipp in 397 AD reaffirmed The Decree of Damasus. Carthage, unlike Hippo, sent its decisions to Rome for ratification.
Pope St. Boniface I (418-422) ratified the decision and declared the canon settled for the Western Patriarchate. He also sent the decision to the Eastern patriarchs in Alexandria, Antioch and Jerusalem. At that point, the Catholic Canon of Sacred Scripture was informally accepted worldwide.
The Fourth Council of Carthage in 419 reaffirmed Pope St. Boniface.
The Council of Nicea II in 787 ratified the same canon as
authoritative for the Eastern Churches.
Finally, the Council of Trent, a worldwide Ecumenical Council, **formally **proclaimed the Catholic Canon of Sacred Scripture in 1546 as authoritative for the whole world.