_Robert I DREUX _____+
                                               | (1123 - 1188)       
                          _Robert II DREUX ____|
                         | (1154 - 1218)       |
                         |                     |_Agnes of BAUDEMONT _
                         |                                           
 _Robert III DREUX ______|
| (1185 - 1234)          |
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|                        |_Yolanda of COUCY ___|
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|                                                                    
|
|--John I DREUX 
|  (1215 - 1249)
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|                         _____________________|
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|                        |                                           
|_Alianor of ST VALÉRY _|
                         |
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