Pierre I Mauclerc de Dreux
Pierre I Mauclerc was born about 1190 in Dreux, Bretagne, France.  He died in May 1250.  He was buried in St. Ived De Braine, France.

 Alix De Bretagne
Alix was born about 1201 in Thouars, Bretagne, France.  She died on October 21st, 1221.

 Jean I "Le Roux" De Dreux
Jean I "Le Roux" was born in 1217 in Dreux, Bretagne, France.  He died at the age of 69 on October 8th, 1286 in Château De L'Isle, , France.

 Yolande De Dreux
Yolande was born in 1218 in Dreux, Bretagne, France.  She died at the age of 54 in 1272.

 Arthur De Dreux
Arthur was born in 1220.

 Alix De Dreux
Alix was born in 1221 in Dreux, Bretagne, France.