Apocrypha
Books placed outside the Hebrew canon by Jerome -- Wisdom, Sirach, Judith, Tobit, the Shepherd of Hermas, and the Maccabees -- identified as non-canonical in the Helmeted Prologue. Jerome states that whatever falls outside the twenty-two canonical books is to be placed among the apocrypha.
Pope Clement VIII, Jerome's Prefaces, On Worship
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I. THE HELMETED PROLOGUE.
— Jerome states that whatever falls outside the twenty-two canonical books is to be placed among the apocrypha, and explicitly names Wisdom, Sirach, Judith, Tobit, the Shepherd, and Maccabees.
"whatever is outside of this is to be placed among the apocrypha. Therefore the Wisdom which is commonly ascribed to Solomon, and the book of Jesus son of Sirach, and Judith, and Tobit, and the Shepherd, are not in the canon. The first book of the Maccabees I found to be Hebrew. The second is Greek, which can be proved also from its very style."