John III , nicknamed The Pious (Portuguese: o Piedoso), was the King of Portugal and the Algarve from 1521 until he died in 1557. He was the son of King Manuel I and Maria of Aragon, the third daughter of the Catholic Monarchs of Spain, Ferdinand II of Aragon and Isabella I of Castile. John succeeded his father in 1521 at the age of nineteen.
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