_Robert I DREUX _____+
                                            | (1123 - 1188)       
                       _Robert II DREUX ____|
                      | (1154 - 1218)       |
                      |                     |_Agnes of BAUDEMONT _
                      |                                           
 _Peter I of DREUX ___|
| (1187 - 1250) m 1213|
|                     |                      _____________________
|                     |                     |                     
|                     |_Yolanda of COUCY ___|
|                                           |
|                                           |_____________________
|                                                                 
|
|--Yolande of DREUX 
|  (1218 - 1272)
|                                            _____________________
|                                           |                     
|                      _____________________|
|                     |                     |
|                     |                     |_____________________
|                     |                                           
|_Alix of THOUARS ____|
  (1200 - 1221) m 1213|
                      |                      _____________________
                      |                     |                     
                      |_____________________|
                                            |
                                            |_____________________