Hapsburg Genealogy:  

Dukes of Austria                                                          Spain

Maximilian I + Mary of Burgundy                Ferdinand + Isabella
(1493-1519)   (daughter of Charles                    (Aragon) - (Castile)
                         the Bold, d. 1477)                                    

                ↓                                                                   ↓

 son:           Philip                  married to              Joanna (the Mad)

               
                                                ↓                                                    ↓

Isabella     +        CHARLES V        brothers        Ferdinand I + Anne of Hungary
of                         (1519-1555)                                 (Emperor 1556-64)
Portugal         (also Charles I of Spain)
                                  ↓   
                                                      ↓                                  
                Philip II (1555-1598)                           Maximillian II (Emperor 1564-76)
                    King of Spain