_Edward III PLANTAGENET __+
                                                   | (1312 - 1377) m 1327     
                       _John of Gaunt PLANTAGENET _|
                      | (1339 - 1398)              |
                      |                            |_Philippa of AVESNES _____+
                      |                              (1311 - 1369) m 1327     
 _Henry IV LANCASTER _|
| (1367 - 1412) m 1380|
|                     |                             _Henry PLANTAGENET _______+
|                     |                            | (1310 - 1360)            
|                     |_Blanche of PLANTAGENET ____|
|                       (1342 - 1368)              |
|                                                  |_Isabel of BRIENNE _______
|                                                    (1320 - 1361)            
|
|--John LANCASTER 
|  (1389 - 1435)
|                                                   _William of BOHUN ________+
|                                                  |                          
|                      _Humphrey DE BOHUN _________|
|                     | (1340 - 1372)              |
|                     |                            |_Elizabeth DE BADLESMERE _+
|                     |                                                       
|_Mary DE BOHUN ______|
  (1370 - 1394) m 1380|
                      |                             _Richard FITZALAN ________+
                      |                            | (1306 - 1375) m 1344     
                      |_Joan FITZALAN _____________|
                        (1347 - 1419)              |
                                                   |_Eleanor PLANTAGENET _____+
                                                     (1318 - 1372) m 1344