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Blessed John Duns Scotus (born c. 1266, Duns, Lothian [now in Scottish Borders], Scotland—died November 8, 1308, Cologne [Germany]; beatified March 20, 1993) was an influential Franciscan realist philosopher and Scholastic theologian who pioneered the classical defense of the doctrine that Mary, the mother of Jesus, was conceived without original sin (the Immaculate Conception). He also argued that the Incarnation of Christ was not dependent on the fact that humanity had sinned, that will is...