Answer
Philip I of Castile, also known as Philip the Handsome, was the son of Mary of Burgundy and Maximilian I of Habsburg. He married Joanna of Castile, known as Joanna the Mad, and became King of Castile in 1506. Philip's reign was short-lived, as he died in 1506 at the age of 28. His son, Charles V, Holy Roman Emperor, inherited the throne of Castile.