John De Monfort II (2nd Earl of Richmond) De Dreux

 Beatrice of England
Beatrice of was born on June 25th, 1242 in Bordeaux, France.  She died at the age of 32 on March 24th, 1275 in London, England.

 Arthur Ii (Duc De Bretagne) De Monfort
Arthur Ii (Duc De Bretagne) was born in 1262.  He died at the age of 50 in 1312.

 John (3rd Earl of Richmond) De Bretagne
John (3rd Earl of Richmond) was born in 1266.  He died at the age of 68 on January 17th, 1334.

 Pierre (Comte De Leon) De Dreux
Pierre (Comte De Leon) was born about 1269.  He died in 1312.

 Blanche De Bretagne
Blanche was born about 1270.  She died in 1327.

 Henry De Dreux
He died in 1284.

 Marie De Bretagne De Dreux