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In page John, Prince of Asturias:

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John's death was followed closely by that of his sister Isabella in 1498. Her only child, Miguel de la Paz, died in 1500. The Spanish kingdoms passed to his younger sister Joanna, her husband Philip the Handsome, and their Habsburg descendants. Philip had himself and Joanna declared as 'Princes of Castile' which her parents took as a lack of respect towards his deceased brother in law.[1]