Llywelyn Siôn
Encyclopedia
Llywelyn Siôn was a Welsh language
Welsh language
Welsh is a member of the Brythonic branch of the Celtic languages spoken natively in Wales, by some along the Welsh border in England, and in Y Wladfa...

 poet.

Although remembered as a poet, he was also a professional manuscript copyist. Iolo Morganwg
Iolo Morganwg
Edward Williams, better known by his bardic name Iolo Morganwg , was an influential Welsh antiquarian, poet, collector, and literary forger. He was widely considered a leading collector and expert on medieval Welsh literature in his day, but after his death it was revealed that he had forged a...

 claimed he was the author of Cyfrinach Beirdd Ynys Prydain, used by the Welsh Gorsedd
Gorsedd
A gorsedd plural gorseddau, is a community or coming together of modern-day bards. The word is of Welsh origin, meaning "throne". It is occasionally spelled gorsedh , or goursez in Brittany....

, but it is now known that Iolo himself was the author of that work. Additionally, the work known as Barddas was attributed to him when it was published, but was later revealed to have been based on manuscripts forged by Morganwg.
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