Catholic World Report, Casey Chalk: St. Jerome, whose feast day is September 30th, is known by Catholics for several things. Many know the fourth-century priest as responsible for the Vulgate, the Latin translation of the Bible, the official biblical text for the Catholic Church for many centuries. Others know of his zeal for the ascetic lifestyle, first in the Syrian desert and later near Bethlehem. And perhaps some know him as one of the Latin Doctors of the Church, a title given on account of his prolific theological discourses and commentaries.
Few, I imagine, know he’s often presented by some Protestants as a proto-Protestant.
Perhaps the most common use of St. Jerome to buttress Protestant theology is the claim that he rejected the deuterocanonical books of the Bible (Tobit, Judith, 1 and 2 Maccabees, Wisdom of Solomon, Sirach and Baruch) as less than Scripture. Read article here.