_Arnold II LOON _____+
                                             | (.... - 1146)       
                        _Louis I LOON _______|
                       | (1107 - 1171)       |
                       |                     |_____________________
                       |                                           
 _Gerard LOON _________|
| (.... - 1191) m 1135 |
|                      |                      _Folmar V METZ ______+
|                      |                     | (.... - 1145)       
|                      |_Agnes of METZ ______|
|                        (.... - 1175)       |
|                                            |_Matilda of MOHA ____+
|                                              (.... - 1157)       
|
|--Arnold III LOON 
|  (.... - 1221)
|                                             _____________________
|                                            |                     
|                       _____________________|
|                      |                     |
|                      |                     |_____________________
|                      |                                           
|_Adelaide of GELDERS _|
   m 1135              |
                       |                      _____________________
                       |                     |                     
                       |_____________________|
                                             |
                                             |_____________________