_Henry IX PIAST ____________+
                                                   | (1369 - 1420)              
                       _Louis III PIAST ___________|
                      | (1405 - 1441)              |
                      |                            |_Anna of PIAST _____________+
                      |                              (1374 - 1405)              
 _John I PIAST _______|
| (1425 - 1453)       |
|                     |                             _Bolko IV PIAST ____________+
|                     |                            | (1363 - 1437)              
|                     |_Margareta of PIAST ________|
|                       (1412 - 1453)              |
|                                                  |_Margareta of UNKNOWN ______
|                                                    (1375 - 1437)              
|
|--Frederick I PIAST 
|  (1446 - 1488)
|                                                   _Henry VII PIAST ___________+
|                                                  | (1343 - 1399)              
|                      _Louis II PIAST ____________|
|                     | (1380 - 1436)              |
|                     |                            |_Helena of ORLAMÜND _______
|                     |                              (.... - 1369)              
|_Hedwig of PIAST ____|
  (1433 - 1471)       |
                      |                             _Frederick VI HOHENZOLLERN _+
                      |                            | (1371 - 1440) m 1401       
                      |_Elisabeth of HOHENZOLLERN _|
                        (1403 - 1449)              |
                                                   |_Elisabeth of WITTELSBACH __+
                                                     (1383 - 1441) m 1401