The other eight sisters appear only in this text and never return in any known works by other medieval authors. Their beautiful, wise and powerful queen, Morgen, would later evolve into Morgan le Fay, Arthur's own sister in later Arthurian tradition, who herself takes the dying Arthur to Avalon. The sisters receive the dying Arthur from Taliesin, delivered to them in a hope they can revive him. Geoffrey of Monmouth's 12-century Vita Merlini introduces the magical island of Avalon, the paradisal 'Isle of Apples', as ruled by the nine entirely benevolent enchantress-sisters, known as great healers and capable of shape-shifting and other magic: Morgen, Moronoe, Mazoe, Gliten, Glitonea, Gliton, Tyronoe, and either Thiten and Thiton or two sisters both named Thitis of whom one of them distinguished as 'best known for her cither'. Samson then proceeds to pray for such utterly irredeemable woman's destruction as soon as he finishes his prayer, she drops down dead. After that Theomacha attempts to flee, but Samson commands her to stay in place, rendering her utterly immobile in the air, and offers her last final chance but she proves to be beyond salvation. Samson calls for her to repent and convert, but she refuses and tells him she wishes to do nothing but evil as she did her whole life. In this work, Saint Samson of Dol encounters just one of the sisters, a wild-looking wicked witch ( malefica) calling herself Theomacha (Enemy of God), as she was flying through a forest on the island of Loire and attacking one of his young deacons. Her description resembles that of the Irish goddess Mórrígan. Koch make an additional (besides Preiddeu Annwfn) connection also to the nine witch sisters and their mother in the 7th-century Breton hagiography Vita Prima Samsonis. According to John and Caitlin Matthews, the women whose killing Cai is credited with in Pa gur are in fact the same as the pagan priestesses from Preiddeu Annwfn. Ystawingun is unidentified but might be associated with Stanton Moor and its stone circle known as 'Nine Ladies' or with Porthsgiwed.

The nine witches of Ystawingun (Ystavingun) are mentioned in a single line of the poem Pa gur (around 1100), where the feat of slaying them in this highland is listed among the greatest achievements of Cai ( Sir Kay in later tradition). The motif of nine supernatural women appears also in some other tales of the Celtic Otherworld, possibly derived from sisterhoods of priestesses of the old Celtic Religion. A raid by Arthur and his warband either steals or destroys the cauldron, but what happens to the maidens of Annwfn is not mentioned. In Preiddeu Annwfn, the nine virgin priestesses of the otherworldy island of Annwfn ( Annwn, the Welsh version of the Celtic Otherworld) guard a magic cauldron, and their magic abilities seem to include fire-breathing. The nine maidens of Annwn in 'The Cauldron of Inspiration' illustration by Ernest Wallcousins (1912)

The tale of gloucester