The queen of Castile, Joanna of Castile, married this member of the house of Habsburg who was the son of which monarch?
Joanna of Castile: Joanna (6 November 1479 – 12 April 1555), called the Mad (Spanish: "Juana la Loca" ), was queen of Castile from 1504 and of Aragon from 1516. Joanna of Castile:  Joanna married Philip the Handsome on 20 October 1496.
i don't know