Llŷr ( (); meaning 'half-speech', triads #8 and #52 or 'half-language') was likely a sea-god in Welsh mythology, related to the Irish Ler ('the Sea'), father of Manannán mac Lir., "Llŷr is often assumed to be borrowed from the Irish Lir, the patronym of the sea-god Manannán

In some legends, he is the leader of the Children of Llyr, who are constantly at war with the Children of Dôn.

Llŷr appears as the father of Brân, Brânwen and Manawydan by Penarddun in the Branwen, Daughter of Llyr, the Second Branch of the Mabinogi.: "Bendigeidfran son of Llŷr was crowned king. His two brothers on the mother's side (Nisien and Efnisien) were sons of Euroswydd by his mother Penarddun." In some sources, he is the father of Creidylad instead of Lludd.

The Welsh Triads states that Llŷr was imprisoned by Euroswydd,, triad #52 and presumably, Penarddun subsequently married Euroswydd, Celt. Enc. vol. 4, p. 930, "Penarddun then married Euroswydd and bore his children Nissyen and Evnissyen" giving birth by Euroswydd to her two younger sons, Nisien and Efnisien, as stated in the Second Branch.

William Shakespeare's play King Lear is based on material taken secondhand (through Raphael Holinshed) from Geoffrey of Monmouth's mythical king King Leir, who has often been connected, but is likely unrelated, to Llŷr., "Many trace Shakespear's.. Lear to Llŷr, but the route is tortuous; Shakespeare drew from Holinshed's Chronicles (1577)", etc.

The House of Llŷr

(*) Unbordered names are figures not in Llŷr's line of descent, though perhaps members of the extended family. (*) This stemma is subject to further elaboration. If the Beli above is to be equated with Beli Mawr then Caswallawn stands as Penarddun's sibling. But Bromwich observes that Penarddun should be emended to being the sister of Beli, which would bring consistency with statement elsewhere that Caswallawn and Brân are cousins., endnotes, p.284- on "Bran Vendigeit m. Llyr".

See also The House of Dôn

Notes

References (Dictionaries) , p. 301, under "Llŷr".

The New Companion to the Literature of Wales, Meic Stevens. (Texts)

Gantz, Jeffrey (translator) (1987). The Mabinogion. New York: Penguin. .