Philip the Handsome was the son of the Holy Roman Emperor Maximilian I. Through his mother Mary of Burgundy he inherited the greater part of the Burgundian state the Burgundian Netherlands and through his wife Joanna the Mad he briefly succeeded to the kingdom of Castile. He was the first Habsburg ruler in Spain and his successors recognized him as Philip I of Spain. Wikipedia
The definitive Wikipedia entry for Philip I of Castile. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Philip_I_of_Castile