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In page John II of Portugal:

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The nickname the Perfect Prince is a posthumous appellation that is intended to refer to Niccolò Machiavelli's work The Prince.[citation needed] John II is considered to have lived his life exactly according to the writer's idea of a perfect prince. Nevertheless, he was admired as one of the greatest European monarchs of his time. Isabella I of Castile often referred to him as El Hombre (The Man).[1][2]