_Robert Afreton ST. MAUR _+
                                             | (1258 - 1300)            
                        _Roger ST. MAUR _____|
                       |                     |
                       |                     |_Alice LISLE _____________
                       |                       (1270 - ....)            
 _Roger ST. MAUR ______|
| (1320 - 1361)        |
|                      |                      __________________________
|                      |                     |                          
|                      |_Joan of DAMAREL ____|
|                        (1285 - 1372)       |
|                                            |__________________________
|                                                                       
|
|--William ST. MAUR 
|  (1349 - 1391)
|                                             _John of BEAUCHAMP _______+
|                                            | (1274 - 1336)            
|                       _John of BEAUCHAMP __|
|                      | (1304 - 1343)       |
|                      |                     |_Joan CHENDUIT ___________
|                      |                                                
|_Cecily of BEAUCHAMP _|
                       |
                       |                      __________________________
                       |                     |                          
                       |_Margaret ST JOHN ___|
                                             |
                                             |__________________________