_Edward II PLANTAGENET _+
                                                       | (1284 - 1327) m 1307   
                              _Edward III PLANTAGENET _|
                             | (1312 - 1377) m 1327    |
                             |                         |_Isabella of CAPET _____+
                             |                           (1292 - 1358) m 1307   
 _John of Gaunt PLANTAGENET _|
| (1339 - 1398)              |
|                            |                          _William III AVESNES ___+
|                            |                         | (1286 - 1337)          
|                            |_Philippa of AVESNES ____|
|                              (1311 - 1369) m 1327    |
|                                                      |_Joan of VALOIS ________+
|                                                        (1294 - 1341)          
|
|--Joan BEAUFORT 
|  (1375 - 1440)
|                                                       ________________________
|                                                      |                        
|                             _Payne ROET _____________|
|                            | (1310 - 1380)           |
|                            |                         |________________________
|                            |                                                  
|_Katherine ROET ____________|
  (1350 - 1403)              |
                             |                          ________________________
                             |                         |                        
                             |_________________________|
                                                       |
                                                       |________________________