Jean IV de Bretagne
Jean IV was born before 1325.  He died in 1345.

 Jeanne of Flanders
Jeanne of was born before 1325.  She died after 1339.

 Jean V de Bretagne
Jean V was born in 1339.  He died at the age of 60 on November 1st, 1399 in Nantes.

 Jeanne de Bretagne
Jeanne was born before 1345 in Brittany, France.  She died on November 8th, 1404 in Drayton, Staffordshire, England.