The children of Dôn, the equivalent of Danu, and probably like her, a goddess of fertility, are Gwydion, Gilvæthwy, Amæthon, Govannon, and Arianrhod, with her sons, Dylan and Llew.[362] These correspond, therefore, in part to the Tuatha Déa, though the only members of the group who bear names similar to the Irish gods are Govannon (= Goibniu) and possibly Llew (= Lug). Gwydion as a culture-god corresponds to Ogma. In the _Triads_ Beli is called father of Arianrhod,[363] and assuming that this Arianrhod is identical with the daughter of Dôn, Professor Rh[^y]s regards Beli as husband of Dôn. But the identification is far from certain, and the theory built upon it that Beli is one with the Irish Bile, and that both are lords of a dark underworld, has already been found precarious.[364] In later belief Dôn was associated with the stars, the constellation Cassiopeia being called her court. She is described as "wise" in a _Taliesin_ poem.[365] This group of divinities is met with mainly in the _Mabinogi_ of Math, which turns upon Gilvæthwy's illicit love of Math's "foot-holder" Goewin. To assist him in his _amour_, Gwydion, by a magical trick, procures for Math from the court of Pryderi certain swine sent him by Arawn, king of Annwfn. In the battle which follows when the trick is discovered, Gwydion slays Pryderi by enchantment. Math now discovers that Gilvæthwy has seduced Goewin, and transforms him and Gwydion successively into deer, swine, and wolves. Restored to human form, Gwydion proposes that Arianrhod should be Math's foot-holder, but Math by a magic test discovers that she is not a virgin. She bears two sons, Dylan, fostered by Math, and another whom Gwydion nurtures and for whom he afterwards by a trick obtains a name from Arianrhod, who had sworn never to name him. The name is Llew Llaw Gyffes, "Lion of the Sure Hand." By magic, Math and Gwydion form a wife for Llew out of flowers. She is called Blodeuwedd, and later, at the instigation of a lover, Gronw, she discovers how Llew can be killed. Gronw attacks and wounds him, and he flies off as an eagle. Gwydion seeks for Llew, discovers him, and retransforms him to human shape. Then he changes Blodeuwedd into an owl, and slays Gronw.[366] Several independent tales have gone to the formation of this _Mabinogi_, but we are concerned here merely with the light it may throw on the divine characters who figure in it.