_John FITZALAN III___+
                                            | (1246 - 1271)       
                       _Richard FITZALAN ___|
                      | (1266 - 1301)       |
                      |                     |_Isabel of MORTIMER _+
                      |                       (.... - 1292)       
 _Edmund FITZALAN ____|
| (1285 - 1326)       |
|                     |                      _Thomas I DEL VASTO _+
|                     |                     | (1239 - 1296)       
|                     |_Alice of DEL VASTO _|
|                       (1269 - 1292)       |
|                                           |_Luigia of CEVA _____
|                                                                 
|
|--Mary FITZALAN 
|  (.... - 1396)
|                                            _John of WARENNE ____+
|                                           | (1231 - 1304)       
|                      _William of WARENNE _|
|                     | (1255 - 1286)       |
|                     |                     |_Alice of LUSIGNAN __+
|                     |                       (1224 - 1255)       
|_Alice of WARENNE ___|
  (1287 - 1338)       |
                      |                      _Robert of VERE _____+
                      |                     | (1240 - 1296)       
                      |_Joan of VERE _______|
                        (1255 - 1293)       |
                                            |_Alice of SANFORD ___
                                              (1229 - 1312)