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The Castle rock
Although the Roman military causeway—of which some fragments still remain—from Brittanodunum to Alterva (i.e. from Dunbar to Cramond) passed close to it, the Castle rock never appears to have become a Roman station; and it is sufficiently curious that the military engineers of the invaders should have neglected such a strong and natural fortification as that steep and insulated mass, situated as it was in Valentia, one of their six provinces in Britain.
source-Old and New Edinburgh
