In Welsh mythology, Modron ("divine mother") was a daughter of Afallach, derived from the Gaulish goddess Matrona. She may have been the prototype of Morgan le Fay from Arthurian legend. She was the mother of Mabon, who bears her name as "Mabon ap Modron" ("Mabon, Son of Modron") and who was stolen away from her when he was three days old and later rescued by King Arthur.
In the Welsh Triads, Modron becomes impregnated by Urien and gives birth to Owain and Morvydd.
Her Gaulish counterpart Matrona is a Celtic mother goddess and tutelary goddess of the River Marne. She is also a fertility and harvest deity often equated with Greece's Demeter or Ireland's Danu. In Britain, she appears as a washerwoman, and thus there would seem to be a connection with the Morrígan.