_William ST. MAUR ___+
                                            | (1349 - 1391)       
                       _Roger II SEYMOUR ___|
                      | (1367 - 1420)       |
                      |                     |_Margaret BROCKBURY _
                      |                       (1351 - 1391)       
 _John SEYMOUR _______|
| (1395 - 1464) m 1424|
|                     |                      _____________________
|                     |                     |                     
|                     |_Maud ESTURNEY ______|
|                                           |
|                                           |_____________________
|                                                                 
|
|--John SEYMOUR 
|  (1425 - 1463)
|                                            _____________________
|                                           |                     
|                      _____________________|
|                     |                     |
|                     |                     |_____________________
|                     |                                           
|_Isabel WILLIAM _____|
  (.... - 1486) m 1424|
                      |                      _____________________
                      |                     |                     
                      |_____________________|
                                            |
                                            |_____________________