Plethyn - Tan Yn Llyn (Welsh)

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Plethyn - Tan Yn Llyn (Welsh)
Breuddwyd Glyndwr (The Dream of Glyndower)
Tan yn Llyn - Plethyn
Seeking the help of the Welsh speaking population! I recently came across this very lovely Welsh song (Lawr Y Lôn) and would very much love to learn it for a LARP character. Unfortunately I have not been able to find the lyrics anywhere (only an English translation). I therefore wanted to ask whether anyone knows where to find the lyrics (I've googled all over the place, believe me) or might be able to write them down. I'd be really grateful! (I don't speak Welsh, so I'm a little reluctant to learn the song by ear... :( )
D. J., Saunders a Valentine Dyna i chi dân a gynheuwyd gan y rhain Tân yn y gogledd yn ymestin lawr i'r de Tân oedd yn gyffro drwy'r holl le
Music in languages I don't understand - Celtic: 2/4 Welsh
Plethyn - Y Ferch Yn Ffair Llanidloes
Google translate tells me that means "The Girl in Llanidoes Fair". They are several pleas for the lyrics in the YouTube comments, but no one's been forthcoming.
Seidir Ddoe - Plethyn
Y grwp gwerin chwedlonol Plethyn yn perfformio eu can enwog, Seidir Ddoe yng nghyngerdd 'Deugain Sain'. Rhagorol! / Legendary Welsh folk group Plethyn perform their famous song, Seidir Ddoe (the Cider of Yesterday). Fantastic!