Coelbren y Beirdd, a supposed "druidic" alphabet invented by forger Iolo Morganwg (1747-1826)
The introduction states that Edeyrn "performed it by command and at the desire of these three lords paramount, namely, Llewelyn, son of Gruffydd, prince of Aberffraw, and king of all Wales; Rhys Fychan, lord of Dinefwr and Ystrad Towy; and Morgan Fychan, lord of the territory between Nedd and Afan and Cilfai, and lord paramount of Morganwg."