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St. Catherine of Siena
This 14th-century Italian religious' faith in God paved the way for her to live a life dedicated to serving others while fighting for peace. Despite being illiterate, she managed to dictate powerful letters to state and Church leaders in a bid to unify the Church and Italy during political unrest. Her efforts worked, as she managed to persuade the pope to return to Italy from France, where he'd sought safety.

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