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Francesco Petrarch, commonly known as Petrarch, is celebrated for his significant contributions to Italian literature and his pivotal role as an early advocate of the humanist movement during the Renaissance. His most renowned work is "Canzoniere," a collection of sonnets and poems. Petrarch's poetry had a profound influence on the development of the Italian language and played a substantial role in the broader European literary and humanist movements of the time. He also wrote on the philosophy of love and authored biographical works and letters.