Psychomachia

…a Christian Latin poet whose Psychomachia (“The Contest of the Soul”), the first completely allegorical poem in European literature, was immensely influential in the Middle Ages.

…the more wide-ranging; in his Psychomachia (“The Contest of the Soul”), he introduced an allegorical form that made an enormous appeal to the Middle Ages. Paulinus is also interesting for his extensive correspondence, much admired in his own day, which kept him in close touch with many leading Christian contemporaries.