Constitutional status of Cornwall of Exeter, styled himself as "King of the English, and ruler of this province of Britons". Edmund's successor Edgar styled himself "King of the English and ruler of the adjacent nations". This was followed by king Aethelred II (978–1016) describing Cornwall not as an English shire, but as a province, or client territory. Surviving charters issued by the Kings of England Edmund I (939–946), Edgar (959–975), Edward the Martyr (975–978), Aethelred II (978–1016), Edmund II (1016), Cnut (1016–1035) and Edward the Confessor (1042–1066) record grants of land in Cornwall made by these kings. In contrast to the easterly concentration of
Edward IV of England to the throne in 1470 in an event known as the Readeption of Henry VI, and Edward took refuge in Flanders, part of Burgundy, accompanied by his younger brother Richard, Duke of Gloucester (later King Richard III of England). The Duke of Burgundy had been Edward's brother-in-law since the marriage of Edward's sister Margaret of York to Charles, Duke of Burgundy, on 3 July 1468. The French declared war on Burgundy, despite the fact that Charles was initially unwilling to help Edward. This prompted Charles to give his aid to Edward, and from Burgundy he raised an army to win