__
                                            |  
                       _Asen of ASEN _______|
                      |                     |
                      |                     |__
                      |                        
 _Ivan I ASEN ________|
| (.... - 1196) m 1183|
|                     |                      __
|                     |                     |  
|                     |_____________________|
|                                           |
|                                           |__
|                                              
|
|--Alexander ASEN 
|  (.... - 1232)
|                                            __
|                                           |  
|                      _____________________|
|                     |                     |
|                     |                     |__
|                     |                        
|_Helen of UNKNOWN ___|
   m 1183             |
                      |                      __
                      |                     |  
                      |_____________________|
                                            |
                                            |__