King Nominoe of Brittany
Nominoe was born on March 7th, 0815.  He died at the age of 36 on March 7th, 0851.

 Argentael de Bretagne
Argentael was born in 0780.

 King Erispoe II of Brittany
Erispoe was born in 0839.  He died at the age of 18 in November 0857.

 Count Gurwant of Rennes
Gurwant was born in 0840.  He died  due to exhaustion on the battlefield at the age of 37 in 0877.