Tutwal (Tudwal: "Tribe-leader"*) is largely unknown from this context. There is a chance this person is the British king Tuduvallus/Thuvahel noted in the life of St. Ninian by Ailred of Rievaulx and an 8th C. latin poem on the same theme*. Mention of the death of St.Martin in Ninian's life, which is known to have been in 397 CE*, places the king at about this time. Ninian is, however, associated with Scotland, and Tuduvallus is probably the same person as Tudwal Tutklyd, given as "son of Kedic son of Dyfynwal Hen" in the "Pedigrees of the Men of the North" (i.e. the old North of the Scottish borderlands and Yorkshire)*. This seems to dictate against this being the same person as our Tutwal, who is in a Cornish genealogy, though there is a thin chance they are the same.

Tudwal Tutklyt is mentioned in the Welsh triads as the father of Ryderch Hael ("the generous")*. The "Whetstone of Tudwal Tutklyd" is one of the "Thirteen treasures of [Northern] Britain" (see Other Works). A brave man's sword sharpened on the stone meant certain death for opponents, even if it drew only a small amount of blood. A cowards sword, however, was rendered useless*. Ryderch was known as generous because he would freely lend another of the treasures - his sword Dyrnwyn ("white tip") which would burst into flame if a well-born man drew it - though its nature meant no one asked*.

The spelling of Tutwal may mark the Mostyn list as of older origins than the Jesus College MS 20 (see Other Works) which lists him with a "d" not a "t" ("t" replacing "d" until 1200 CE*), though see Note.