Gwydion

Gwydion fab Dôn (Welsh, “Gwydion son of Dôn”) is the master enchanter of Math the Son of Mathonwy — the Fourth Branch of the Mabinogion. He is the son of Dôn (the Welsh cognate of the Irish goddess Danu), brother of Arianrhod, uncle and foster-father of Lleu Llaw Gyffes, and nephew of Math. He is the most accomplished magician in the Welsh corpus and also one of its most morally ambiguous figures.

The theft of the swine

The Fourth Branch opens with Gwydion as a scheming courtier. His brother Gilvaethwy loves Math’s foot-holder Goewin but has no access to her. Gwydion devises a stratagem: he arranges a war. He learns that Pryderi son of Pwyll has acquired pigs from the Otherworld — “small animals, and their flesh better than the flesh of oxen.” He travels south in the guise of a bard, entertains Pryderi’s court with stories through the night, and trades the pigs for illusory horses and hounds that dissolve into toadstools and fungi after one day. He and Gilvaethwy escape north with the swine before the illusion fades. The war that follows kills Pryderi; Gilvaethwy rapes Goewin during the chaos; Math punishes both brothers by transforming them into breeding pairs of animals for three years.

This episode establishes Gwydion’s character: he is brilliant, resourceful, and willing to cause enormous harm — including war and death — to serve immediate ends. His punishment is proportionate: he who deceived others spends three years in forms that cannot deceive.

Raising Lleu

After his transformation and restoration, Gwydion is the one who recommends Arianrhod as Math’s foot-holder and inadvertently triggers the revelation of her sons. He snatches the small second child, raises it in secret, and spends years pitting his craftiness against Arianrhod’s tyngedau on Lleu’s behalf. His love for his nephew is the clearest example of selfless motivation in his character — everything he does for Lleu, he does through genuine attachment rather than self-interest.

The crafting of Blodeuwedd from flowers is his most famous act of enchantment: “they took the blossoms of the oak, and the blossoms of the broom, and the blossoms of the meadow-sweet, and produced from them a maiden, the fairest and most graceful that man ever saw.” The creation of a human being from plant material is presented in the tale without theological anxiety — it is simply what Math and Gwydion are capable of.

Restoring Lleu from the eagle

When Lleu is betrayed and disappears in eagle form, Gwydion searches the land for him. He finds an oak tree between two lakes where an eagle sits — the oak directly beneath it covered in rotting flesh, the sow below feeding on what falls. He sings three englynion under the tree, each naming Lleu more directly:

“Oak that grows beneath the steep; / Stately and majestic is its aspect! / Shall I not speak it? / That Llew will come to my lap?”

The eagle descends branch by branch to his knee. Gwydion strikes it with his wand. Human form returns. It is one of the most moving passages in the Mabinogion: the great enchanter who caused so much through cleverness here uses poetry, patience, and address to heal rather than manipulate.

Gwydion and bardic power

Gwydion is described as “an excellent teller of tales.” His power moves between magic and poetry without distinguishing them clearly — the englynion that restore Lleu work the same way his illusions work, by making something true through the authoritative naming of what is. He is the figure in the Welsh tradition who most fully embodies the connection between bardic gift and magical capacity: both depend on the ability to make something real by speaking it correctly.