Tintagel, Tintaguel, Tintaiel, Tintoel

Naturally, this dukedom is composed of the territory around Tintagil Castle, possibly including more or less the whole northern half of present-day Cornwall.

Chrétien de Troyes mentions Tintagil as one of Arthur’s places for holding court; it was in Tintagil that Erec, still with Arthur’s court, heard the news of King Lac’s death. Assuming that Tibaut of Tintagil, was one of Arthur’s vassals, his recidency there would be quite compatible with Arthur’s use of it as a court city.