The queen of Castile, Joanna of Castile, married this member of the house of Habsburg who was the son of which monarch?
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. The son of Holy Roman Emperor Maximilian I, at the age of three Philip inherited the greater part of the Duchy of Burgundy and the Burgundian Netherlands (as Philip IV) from his mother, Mary, and at 27 briefly succeeded to the Crown of Castile as the husband of Queen Joanna, who was also heir presumptive to the Crown of Aragon. He was the first Habsburg monarch in Spain. He never inherited his father's territories or became Holy Roman Emperor because he predeceased his father, but his son Emperor Charles V eventually united the Habsburg, Burgundian, Castilian, and Aragonese inheritances.
Charles de La Cerda Charles de La Cerda, commonly known as Charles of Spain (French: "Charles d'Espagne" ) (1327 – 8 January 1354 in L'Aigle), was a Franco-Castilian nobleman and soldier, the son of Alfonso de la Cerda (died 1327) and Isabelle d'Antoing, and grandson of Alfonso de la Cerda (1270–1333). He was a distant cousin of John II of France.