_Siemowit PIAST _____+
                                            |                     
                       _Lestek PIAST _______|
                      | (0870 - 0930)       |
                      |                     |_____________________
                      |                                           
 _Siemomysł PIAST ___|
| (.... - 0950)       |
|                     |                      _____________________
|                     |                     |                     
|                     |_____________________|
|                                           |
|                                           |_____________________
|                                                                 
|
|--Czcibor PIAST 
|  (.... - 0972)
|                                            _____________________
|                                           |                     
|                      _____________________|
|                     |                     |
|                     |                     |_____________________
|                     |                                           
|_____________________|
                      |
                      |                      _____________________
                      |                     |                     
                      |_____________________|
                                            |
                                            |_____________________