Welsh Mythology: Cantre'r Gwaelod, Llyn Llion and the Old Names of WalespostCultures and mythsWelshGwaelodCelticMerlinAvalonDruidsCultures and myths Welsh Gwaelod Celtic Merlin Avalon Druids.

Welsh Mythology

Cantre’r Gwaelod, Llyn Llion and the Old Names of Wales

Welsh legend runs through several of my Atlantis pages: a drowned kingdom in Cardigan Bay, a flood lake that burst, and the old names behind Merlin, Morgan and Lleu. These are the pages where Wales comes in.

Sunken lands

Wales and Brittany both remember a land that went under the sea. These pages follow Cantre’r Gwaelod and the city of Ys.

The Lowland Hundred, the sunken kingdom in Cardigan Bay called the Welsh Atlantis.
The drowned Breton city, whose legend may draw on Cantre'r Gwaelod.

Flood stories

The Welsh flood comes from a lake, Llyn Llion, that burst. I put it next to the other flood traditions of the old world.

Dwyfan and Dwyfach, who escape when the lake of Llyn Llion bursts, from triads that may be forgeries by Iolo Morganwg.

Figures

These are the people of Welsh legend that I follow: Lleu, Merlin, Morgan le Fay and the druids.

Places and peoples

The last pages go to Avalon, the bluestones of Stonehenge and the Mandan words that Catlin set next to Welsh.

The isle of Arthur's legend, and Ynes Mon, Anglesey, off the coast of Wales.
The bluestones from Waun Mawn in Pembrokeshire, and the May festival of Calan Mai.
Catlin's list of words shared by the Mandan tongue and Welsh.

Published: 30 Oct 2026

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