Author Adam Ardrey claims that instead of the romantic English king of legend who lived at Camelot – which is often said to be Tintagel in Cornwall or in Wales – Arthur was actually Arthur Mac Aedan, the sixth-century son of an ancient King of Scotland, whose Camelot was a marsh in Argyll. He also suggests that Arthur pulled the sword Excalibur from a stone at Dunadd near Kilmartin, died near Falkirk and was buried on the Hebridean island of Iona, which he declares to be Avalon. Ardrey, an amateur historian who works as an advocate in Edinburgh and previously...