King Vortigern of the Britons
Vortigern of the Britons was born about 0400.  He died after 0464.

 Sevira verch Maxen

 King Catigern ap Votigern of Powys
Catigern ap Votigern of Powys was born about 0404.  He died about 0470.

 Brydw ap Vortigern
Brydw ap Vortigern was born about 0422.