_Ernest WITTELSBACH ____+
                                                   | (1373 - 1438)          
                          _Albert III WITTELSBACH _|
                         | (1401 - 1459)           |
                         |                         |_Elisabetta VISCONTI ___+
                         |                           (1374 - 1431)          
 _Albert IV WITTELSBACH _|
| (1447 - 1507)          |
|                        |                          _Eric I WELF ___________+
|                        |                         | (1383 - 1427)          
|                        |_Anna of WELF ___________|
|                          (1414 - 1474)           |
|                                                  |_Elisabeth of WELF _____+
|                                                                           
|
|--William IV WITTELSBACH 
|  (1493 - 1549)
|                                                   _Ernest HABSBURG _______+
|                                                  | (1377 - 1424) m 1411   
|                         _Frederick V HABSBURG ___|
|                        | (1415 - 1493)           |
|                        |                         |_Cymburgis of PIAST ____
|                        |                           (1394 - 1429) m 1411   
|_Kunigunde of HABSBURG _|
  (1464 - 1520)          |
                         |                          _Duarte AVIZ ___________+
                         |                         | (1391 - 1438)          
                         |_Eleanor of AVIZ ________|
                           (1434 - 1467)           |
                                                   |_Leonor of TRASTÁMARA _
                                                     (1402 - 1444)