Sefnyn

{{Short description|14th-century Welsh poet}}

{{More citations needed|date=January 2015}}

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Sefnyn was a Welsh language court poet from Anglesey, north Wales. His son, GWILYM ap SEFNYN, was also a poet.{{Cite DWB|id=s-SEFN-YN0-1375|title = SEFNYN, an Anglesey poet of the second half of the 14th century}}{{Cite DWB|id=s-GWIL-APS-1440|title = GWILYM ap SEFNYN (Fl. C. 1440), poet|fewer-links=yes}}