Cyril, Bishop of Jerusalem and Doctor of the Church, identified the Old Testament canon as that of the 22 book Hebrew canon in his Catechetical Lecture (IV, 33) written around 350 AD (prior to the Councils of Hippo/Carthage and prior to Jerome’s Vulgate translation).
“Learn also diligently, and from the Church, what are the books of the Old Testament, and what those of the New. And, pray, read none of the apocryphal writings: for why do you, who know not those which are acknowledged among all, trouble yourself in vain about those which are disputed?... Of these read the two and twenty books, but have nothing to do with the apocryphal writings. Study earnestly these only which we read openly in the Church. Far wiser and more pious than yourself were the Apostles, and the bishops of old time, the presidents of the Church who handed down these books. Being therefore a child of the Church, trench thou not upon its statutes. And of the Old Testament, as we have said, study the two and twenty books, which, if you are desirous of learning, strive to remember by name, as I recite them. For of the Law the books of Moses are the first five, Genesis, Exodus, Leviticus, Numbers, Deuteronomy. And next, Joshua the son of Nave, and the book of Judges, including Ruth, counted as seventh. And of the other historical books, the first and second books of the Kings are among the Hebrews one book; also the third and fourth one book. And in like manner, the first and second of Chronicles are with them one book; and the first and second of Esdras are counted one. Esther is the twelfth book; and these are the Historical writings. But those which are written in verses are five, Job, and the book of Psalms, and Proverbs, and Ecclesiastes, and the Song of Songs, which is the seventeenth book. And after these come the five Prophetic books: of the Twelve Prophets one book, of Isaiah one, of Jeremiah one, including Baruch and Lamentations and the Epistle; then Ezekiel, and the Book of Daniel, the twenty-second of the Old Testament…But let all the rest be put aside in a secondary rank. And whatever books are not read in Churches, these read not even by yourself, as you have heard me say.”