Note 1 — INTRODUCTORY

‘The Songs of the Graves,’ in the twelfth century Black Book of Carmarthen. “A grave there is for March (or Mark),”—so the lines run,—“a grave for Gwythur, a grave for Gwgawn of the Ruddy Sword; a mystery is the grave of Arthur”: or, as Sir John Rhys translates, “not wise the thought—a grave for Arthur.”