__
                                            |  
                       _Andronikos DOUKAS __|
                      | (.... - 0910)       |
                      |                     |__
                      |                        
 _John DOUKAS ________|
| (.... - 1088)       |
|                     |                      __
|                     |                     |  
|                     |_____________________|
|                                           |
|                                           |__
|                                              
|
|--Constantine DOUKAS 
|  (.... - 1074)
|                                            __
|                                           |  
|                      _____________________|
|                     |                     |
|                     |                     |__
|                     |                        
|_Irene PREGONITISSA _|
                      |
                      |                      __
                      |                     |  
                      |_____________________|
                                            |
                                            |__