_Boleslaus I PŘEMYSLID _+
                                                   | (0915 - 0967)           
                        _Boleslaus II PPŘEMYSLID _|
                       | (0930 - 0998)             |
                       |                           |_Biagota of UNKNOWN _____
                       |                             (0901 - ....)           
 _Oldřich PŘEMYSLID _|
| (0975 - 1034)        |
|                      |                            _________________________
|                      |                           |                         
|                      |_Adiva of UNKNOWN _________|
|                                                  |
|                                                  |_________________________
|                                                                            
|
|--Bretislav I PŘEMYSLID 
|  (1002 - 1054)
|                                                   _________________________
|                                                  |                         
|                       ___________________________|
|                      |                           |
|                      |                           |_________________________
|                      |                                                     
|_Božena of UNKNOWN __|
  (.... - 1052)        |
                       |                            _________________________
                       |                           |                         
                       |___________________________|
                                                   |
                                                   |_________________________