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
Handyside Edgar by their father), and the Osborne Estate (created around 100 years earlier by a Dr Osborne). He appears to have already had kinsfolk in Jamaica including several half-brothers and sisters fathered by Alexander Edgar with negro slaves. Handyside Edgar acted as a physician in both Trelawney and Montego Bay in Jamaica. He was elected a Fellow of the Royal Society of Edinburgh in 1786. His proposers were John Robison, John Playfair, and Andrew Dalzell. He died in Jamaica on 8 June 1806. He is buried there in St James Churchyard. A dispute over his will, between his brother Alexander Edgar