_Robert I ARTOIS ____________+
                                                 | (1216 - 1249) m 1237        
                       _Robert II of ARTOIS _____|
                      | (1250 - 1302)            |
                      |                          |_Matilda of REGINAR _________+
                      |                            (1224 - 1288) m 1237        
 _Philip of ARTOIS ___|
| (1269 - 1298) m 1281|
|                     |                           _Peter II of COURTENAY ______+
|                     |                          | (1218 - 1249)               
|                     |_Amicie of COURTENAY _____|
|                       (.... - 1275)            |
|                                                |_Petronille of JOIGNY _______
|                                                                              
|
|--Isabelle of ARTOIS 
|  (1288 - 1344)
|                                                 _John I of DREUX ____________+
|                                                | (1217 - 1286)               
|                      _John II of DREUX ________|
|                     | (1238 - 1305)            |
|                     |                          |_Blanche of BLOIS-CHAMPAGNE _+
|                     |                            (1226 - 1283)               
|_Blanche of DREUX ___|
  (1271 - 1327) m 1281|
                      |                           _Henry III PLANTAGENET ______+
                      |                          | (1207 - 1272) m 1236        
                      |_Beatrice of PLANTAGENET _|
                        (1242 - 1274)            |
                                                 |_Eleanor of BARCELONA _______+
                                                   (1223 - 1291) m 1236