The Roman Map of Britain Mananna? Isle of Arran

Manna (R&C 280) next

   Williams supposed Manna a corrupt Man[an]na. 'The isle of Arran was reputed to be the house of Manannan, the god of the sea, and was also known as Emain Ablach...' It's position in the list next to Botis Bute suits the equation well.