1st » Battle of Arkinholm, Royal forces end the Black Douglas hegemony in Scotland.
22nd » Start of the Wars of the Roses: at the First Battle of St Albans, Richard of York, 3rd Duke of York called Richard, Duke of York, defeats and captures King Henry VI of England.
Famous Deaths for May 1455
22nd » Edmund Beaufort, 2nd Duke of Somerset, English commander (b. 1406)
22nd » Henry Percy, 2nd Earl of Northumberland, English commander (b. 1393)