Duke Of Lancaster John Of Gaunt
John was born in 1340.  He died at the age of 59 in 1399.

 Catherine Swynford
Catherine is no longer alive.

 Marquess Of Dorset John Beaufort
John was born in 1373.  He died at the age of 37 in 1410.

 Cardinal Henry Beaufort
Henry was born in 1375.  He died at the age of 72 in 1447.

 Duke Of Exeter Thomas Beaufort
Thomas was born in 1377.  He died at the age of 50 in 1427.

 Duke Of Somerset Edmund Beaufort
He died in 1455.