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This is all corroborated by the name of Merlin, which is in Welsh Myrᵭyn, and by its association with Carmarthen, in Welsh 'Caer Vyrᵭin,' 'Myrᵭin's Caer or Fortress.' On the other hand, it is a matter of no doubt that here Myrᵭin is the regular and correct form of the ancient Brythonic name of the place, namely, Moridûnon, which meant a sea-fort, and correctly described the spot, in that it is reached by the tides in the Towy. Thus we have Myrᵭin as the name of the enchanter and as that of the town, which is to be explained by an accident of Welsh, my conjecture being that the two names were distinguished, in an earlier stage of the language, by a difference of termination. We have only to take Moridûnon as given by Ptolemy, and to suppose a derivative of a common form made from it, and we have Moridûnjos, which might mean 'him of Moridûnon or the sea-fort.' Taken in reference to Carmarthen, it would explain the legend which makes the prophet a native, under peculiar circumstances, of that town; but taken in connection with his mythic home and prison, it suits his abode in Bardsey or the Armoric isle of Sein, where he was also believed to have been born;