James,
The Council of Trent was the last Council to define the Canon... but it was a just a "official" declaration of what was already in place.
As far as I have read (you are much better educated on the Canons) the Western Canon stayed the same since about the year 390.
"If any one shall say, or shall believe, that other Scriptures, besides those which the Catholic Church has received, are to be esteemed of authority, or to be venerated, let him be anathema." Council of Toledo, Canon 12 (A.D. 400).
"A brief addition shows what books really are received in the canon. These are the desiderata of which you wished to be informed verbally: of Moses five books, that is, of Genesis, of Exodus, of Leviticus, of Numbers, of Deuteronomy, and Josue, of Judges one book, of Kings four books, also Ruth, of the Prophets sixteen books, of Solomon five books, the Psalms. Likewise of the histories, Job one book, of Tobias one book, Esther one, Judith one, of the Machabees two, of Esdras two, Paralipomenon two books. Likewise of the New Testament: of the Gospels four books, of Paul the Apostle fourteen epistles, of John three, epistles of Peter two, an epistle of Jude, an epistle of James, the Acts of the Apostles, the Apocalypse of John." Pope Innocent (regn. A.D. 401-417), Epistle to Exsuperius Bishop of Toulose, 6:7,13 (A.D. 405).