_Edward III PLANTAGENET _+
                                                                | (1312 - 1377) m 1327    
                                _Edmund of Langley PLANTAGENET _|
                               | (1341 - 1402)                  |
                               |                                |_Philippa of AVESNES ____+
                               |                                  (1311 - 1369) m 1327    
 _Richard of Conisbrough YORK _|
| (1375 - 1415)                |
|                              |                                 _Peter IVREA ____________+
|                              |                                | (1334 - 1368)           
|                              |_Isabella of IVREA _____________|
|                                (1355 - 1392)                  |
|                                                               |_Maria of PADILLA _______
|                                                                                         
|
|--Isabel PLANTAGENET 
|  
|                                                                _________________________
|                                                               |                         
|                               _Roger of MORTIMER _____________|
|                              |                                |
|                              |                                |_________________________
|                              |                                                          
|_Anne of MORTIMER ____________|
  (1388 - 1411)                |
                               |                                 _________________________
                               |                                |                         
                               |________________________________|
                                                                |
                                                                |_________________________