Saint Isaias (Seventh Century B.C.)

The great prophet Isaias, who deserves to be remembered as a saint on his feast day, was the one who foretold of the Blessed Virgin Mary — in Chapter 7, verse 14 of his great prophetical book — “Behold a virgin shall conceive and bear a son, and His name shall be called Emmanuel.” No reader of the Old Testament can ignore this prophecy. One who does not sincerely look in the Old Testament for the beautiful, virginal maiden who was to be its fulfillment, and one who does not immediately find her in Mary, the virginal spouse of Joseph, is an unbeliever and a desecrator of the inspired word of God. He pretends to love the Bible, while he ignores its greatest prophet and its greatest prophecy.

Isaiah, by Michelangelo, (c. 1508–1512, Sistine Chapel ceiling, Vatican City) https://commons.wikimedia.org/wiki/File:Michelangelo,_profeti,_Isaiah_01.jpg

Isaiah, by Michelangelo, c. 1508–1512, Sistine Chapel ceiling, Vatican City (source)