Robert II de Dreux
Robert II was born about 1154.  He died in 1218.

 Yolande de Coucy
Yolande was born before 1170.  She died in 1222.

 Robert III de Dreux
Robert III was born about 1185.  He died after 1200.

 Pierre I Mauclerc de Dreux
Pierre I Mauclerc was born in 1190.  He died at the age of 60 in May 1250.

 Philippa de Dreux