abstract:The title of Earl of Northumberland was created several times in the Peerage of England and of Great Britain, succeeding the title Earl of Northumbria. Its most famous holders were the House of Percy (also Perci), who were the most powerful noble family in Northern England for much of the Middle Ages.
The EarlofNorthumberland, who should have supported the king, somehow never managed to get in the battle and of course it was the Stanleys who decisively joined in on Henry's side.