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" From his mother, Philip inherited the Burgundian possessions. But a few years after Philip’s marriage, his wife Joanna, daughter of Isabella and Ferdinand, inherited not only Castile, but Aragon, Sicily, Naples, America, and the Indies. So when Charles V came of age, he inherited from his father, his mother, and his grandparents a great empire. He was, at once, prince of the Netherlands, king of a united Spain, and emperor of Germany. "
― Anthony Bailey , The Low Countries: A History