Manaw Gododdin
…Forth. The definitive years were the middle of the 7th century, when Penda of Mercia led an alliance of Mercians, Cymry (both from the north and from Gwynedd), East Anglians, and Deirans against Bernicia. Penda was defeated and killed at the Battle of Winwaed in 655, ending the alliance and cementing Bernician…