Eudaf Hen Octavian ap Einydd
Eudaf Hen Octavian was born in 0315.

 King Cynan of Dumnonia
Cynan was born in 0345.  He died at the age of 75 in 0420.

 King Conan Meriadoc ("the Barbarian") of Brittany
Conan Meriadoc, known as "the Barbarian", was born about 0345 in Brittany and Domnonee.  He died in 0421.