Llywelyn Siôn

Llywelyn Siôn (1540 – c.1615) was a Welsh language poet.

Although remembered as a poet, he was also a professional manuscript copyist. Iolo Morganwg claimed he was the author of Cyfrinach Beirdd Ynys Prydain, used by the Welsh Gorsedd, 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.

References

• Oxford Dictionary of National Biography, Llywelyn Siôn [Llywelyn of Llangewydd] (c.1540–c.1615), Welsh language poet and copyist, by Glanmor Williams.
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The two references to the DNB first edition are both to Llywelyn Siôn (under different names), a duplication not picked up by the editors.