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The apostle Paul, although not part of "the twelve": His fall from a horse illustrates his conversion en route to Damascus. Also, he is represented with a book or scroll of the new Law, his epistles, or with the sword that illustrates both his beheading and the sharpness of the Word of God.

© Wikimedia. The Conversion of Saint Paul on the Road to Damascus, by Caravaggio, church of Santa Maria del Popolo, Rome.