Dylan ail Don

The story of Dylan reflects ancient Celtic myths that were handed down orally for some generations before being written down during the early Christian period by clerics.

[2] The story as it has been preserved therefore exhibits elements and archetypes characteristic of both Celtic pagan and Christian mythologies.

Dylan was killed by his uncle, and it has been said that "The clamour of the waves dashing upon the beach is the expression of their longing to avenge their son.

[5] One of the sons, Lleu Llaw Gyffes, is borne away by Gwydion as a "lump of flesh" and concealed in a chest until maturity, but the other, a sturdy blonde boy, was immediately forsaken by his mother yet was acknowledged by his great uncle Math and given the name Dylan.

[7] According to this line of thinking, representation of Dylan in Welsh literature and in folklore alludes to the attributes of his supposed divine ancient Celtic prototype.

"[T]wo sons were born at one birth – Dylan and Lleu, who are considered as representing the twin powers of darkness and light.

"[7]Dylan's rock is located north of the Church of St Beuno's Church at Clynnog Fawr on the seashore, which must be on or near the location of his grave as told in Englynion y Beddau (Stanzas of the Grave)[1] of the Black Book of Carmarthen xxxii:[8] yn yd vna ton tolo Bet Dilan Llan Bevno.

The Mabinogi gives us the débris of myths explaining how an anthropomorphic sea-god was connected with the goddess Arianrhod and slain by a god Govannon.

Her Uncle, Math ap Mathonwy, is the King of Gwynedd, and during the course of the story, Arianrhod gives birth to her two sons; Dylan ail Don and Lleu Llaw Gyffes through magical means.

[5] In the Welsh Triads, we are given a context for an actual Arianrhod who appears as the daughter of Beli Mawr[12] and the sister of Caswallawn (the historical Cassivellaunus).