I am Joanna of Castile Joanna (6 November 1479 – 12 April 1555), historically known as Joanna the Mad (Spanish: Juana la Loca), was the nominal Queen of Castile from 1504 and Queen of Aragon from 1516 to her death in 1555. She was married by arrangement to Philip the Handsome, Archduke of Austria, of the House of Habsburg, on 20 October 1496.[1] Following the deaths of her brother, John, Prince of Asturias, in 1497, her elder sister Isabella in 1498, and her nephew Miguel in 1500, Joanna became