_Sancho IV IVREA ____+
                                                        | (1258 - 1295)       
                        _Ferdinand IV IVREA ____________|
                       | (1285 - 1312)                  |
                       |                                |_Maria of IVREA _____+
                       |                                  (1265 - 1321)       
 _Alfonso XI BURGUNDY _|
| (1311 - 1350)        |
|                      |                                 _____________________
|                      |                                |                     
|                      |_Constanza Dinisez of BURGUNDY _|
|                        (1289 - 1313)                  |
|                                                       |_____________________
|                                                                             
|
|--Fadrique Alfonso ENRÍQUEZ 
|  (1333 - 1358)
|                                                        _____________________
|                                                       |                     
|                       ________________________________|
|                      |                                |
|                      |                                |_____________________
|                      |                                                      
|_Eleanor DE GUZMAN ___|
  (1310 - 1351)        |
                       |                                 _____________________
                       |                                |                     
                       |________________________________|
                                                        |
                                                        |_____________________