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. Philip I of Castile: Philip I (22 July 1478 – 25 September 1506) called the Handsome or the Fair, was the first member of the house of Habsburg to be King of Castile.
i don't know