_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)          
|
|--John LANCASTER 
|  (1362 - 1365)
|                                                       _Henry PLANTAGENET _____+
|                                                      | (1281 - 1345) m 1296   
|                             _Henry PLANTAGENET ______|
|                            | (1310 - 1360)           |
|                            |                         |_Maud CHAWORTH _________+
|                            |                           (1281 - 1322) m 1296   
|_Blanche of PLANTAGENET ____|
  (1342 - 1368)              |
                             |                          _Henry of BEAUMONT _____+
                             |                         | (1285 - 1339) m 1310   
                             |_Isabel of BEAUMONT _____|
                               (1315 - 1360)           |
                                                       |_Alice of COMYN ________+
                                                         (1291 - 1349) m 1310