Although most of the surviving elements of Tintagel castle, built by Richard Earl of Cornwall, in the 1230s are today on the mainland it is interesting that the Gough map locates it on the island, see image below.
[Click image to enlarge]
Detail from facsimile of Gough Map, Ordnance Survey .
Perhaps, this was because the main part of the castle, the Great Hall, was located there.
Tintagel castle Great Hall, English Heritage.
That fell into ruin by 1337 which perhaps lends support to the suggestion that the map’s prototype dates from c. 1280.
The map labels Totnes as Dertesmour and refers to Brutus’s landing there. Motland appears to refer to Looe Island. A label by it is now indecipherable but may well have been referring to the legend that Joseph of Arimathea and the child Christ landed there. Celly is the Isles of Scilly.
Looe island.
ArthurianWeb 