Henrici Quinti, Angliæ Regis, Gesta, is a first-hand account of the Agincourt Campaign, and subsequent events to his death in 1422. The author of the first part was a Chaplain in King Henry's retinue who was present from King Henry's departure at Southampton in 1415, at the siege of Harfleur, the battle of Agincourt, and the celebrations on King Henry's return to London. The second part, by another writer, relates the events that took place including the negotiations at Troye, Henry's marriage and his death in 1422.
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Trearddur aka Coetan Arthur Burial Chamber is in Holyhead, Anglesey, Prehistoric Anglesey Burial Chambers.
Archaeologia Cambrensis 1867. About a quarter of a mile further on, near Trearddur farm, close to the road on the right, there are the traces of a similar cromlech [Trearddur aka Coetan Arthur Burial Chamber [Map]] (now nearly obliterated), called Coetan Arthur. Near this spot, in 1837, a vessel containing a great many Roman copper coins was found, of the later emperors. I took them to the British Museum, but there was none peculiar; and I regret that they were purloined in transmission by post to the owner. Nearer Holyhead, on the same road, there is a fine maenhir on the right, in a field near Ty Mawr farm. W. O. Stanley. Penrhos. March 23, 1867.
Archaeological Journal Volume 28 1871 Pages 97-108. 23. Trearddur [Map] (w).
A cromlech called Coetan Arthur, Arthur's quoit; about a quarter of a mile from the last. In 1837 a fictile vase was found there, containing Roman coins; Angh. Llwyd, p. 208; Arch. Cambr., third series, vol. xiii. p. 234. A few stones only remain.