SEITHENYN

'Seithenyn ' (sometimes spelt 'Seithennin') is a figure from Welsh legend, apparently contemporary with King Gwyddno Garanhir. He is the protagonist of a poem in the Llyfr Du Caerfyrddin (Black Book of Carmarthen). According to legend, he was responsible for the sea-defences of Cantref Gwaelod (the 'Lowland Hundred') or ''Maes Gwyddno'' ('Plain of Gwyddno'), in the kingdom of the legendary Gwyddno Garanhir, but neglected them one night because of his drunkenness. Because of this neglect, the sea overran it.
Cantref Gwaelod is the name of a shallow reef reaching up to 11km to seaward beneath the waters of Cardigan Bay off the coast of Ceredigion near Aberdyfi, Wales.
Seithenyn, (in some later sources the son of Seithyn Saidi), was in charge of the embankment, and as such, it was his failure to discharge his duties which led to the drowning of Cantre'r Gwaelod. Seithenyn is also listed in the Triads of the Island of Britain as one of the ''Three Immortal Drunkards of the Isle of Britain''.
Sir John Rhys posited a connection between Seithenyn and the Setantii, a Celtic tribe living in the north west of England.^[1].

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References

Notes

1. ''Celtic Folklore: Welsh and Manx''(1901), Ch. 6

References

★ Rhys, John (1901). ''Celtic Folklore: Welsh and Manx''