_________________________________________
                                            |                                         
                       _____________________|
                      |                     |
                      |                     |_________________________________________
                      |                                                               
 _Richard ____________|
|  m 1231             |
|                     |                      _________________________________________
|                     |                     |                                         
|                     |_____________________|
|                                           |
|                                           |_________________________________________
|                                                                                     
|
|--John 
|  (1232 - ....)
|                                            _John FitzGilbert Marshal _______________+
|                                           | (.... - 1165) m 1141                    
|                      _William Marshal ____|
|                     | (1146 - 1219) m 1189|
|                     |                     |_Sibyl de Salisbury _____________________+
|                     |                        m 1141                                 
|_Isabella Marshal ___|
  (1200 - 1240) m 1231|
                      |                      _Richard Strongbow FitzGilbert de Clare _+
                      |                     | (1130 - 1176) m 1171                    
                      |_Isabel de Clare ____|
                        (1174 - 1220) m 1189|
                                            |_Aoife 'Eva' MacMurrough ________________+
                                               m 1171