_Henry de Percy ________________+
                                                 | (1320 - 1368) m 1334           
                          _Henry Percy __________|
                         | (1341 - 1408) m 1358  |
                         |                       |_Mary Plantagenet ______________+
                         |                         (1321 - 1362) m 1334           
 _Henry 'Hotspur' Percy _|
| (1364 - 1403) m 1379   |
|                        |                        _Ralph de Neville ______________+
|                        |                       | (1291 - 1367) m 1326           
|                        |_Margaret de Neville __|
|                          (.... - 1372) m 1358  |
|                                                |_Alice de Audley _______________+
|                                                  (.... - 1373) m 1326           
|
|--Henry Percy 
|  (1392 - 1455)
|                                                 _Roger Mortimer ________________+
|                                                | (.... - 1360)                  
|                         _Edmund Mortimer ______|
|                        | (1351 - 1381) m 1359  |
|                        |                       |________________________________
|                        |                                                        
|_Elizabeth Mortimer ____|
  (1371 - ....) m 1379   |
                         |                        _Lionel of Antwerp Plantagent __+
                         |                       | (1338 - 1368) m 1342           
                         |_Philippa Plantagenet _|
                           (1355 - 1382) m 1359  |
                                                 |_Elizabeth 'Isabella' de Burgh _
                                                    m 1342