Great-grandfather: Charles the Bold, duke of Burgundy. Paternal grandfather: Maximilian I. Father: Philip I, king of Castile.
Great-grandfather: Charles the Bold, duke of Burgundy. Paternal grandfather: Maximilian I. Father: Philip I, king of Castile. Maternal grandparents: Ferdinand and Isabella. FTP, what Habsburg used all of these beneficial relations to become king of Spain and Holy Roman Emperor by 1519?
Great-grandfather: Charles the Bold, duke of Burgundy. Paternal grandfather: Maximilian I. Father: Philip I, king of Castile.
Charles V (or Charles I)