Tylluan Wen is a Welsh language film / television drama produced in Wales in 1997 by Ffilmiau'r Nant and directed by Angharad Jones.
The Castell Blodeuwedd scene was filmed at Tomen y Mur Roman Fort, Trawsfynydd, near the coastal town of Porthmadog.
Martha arrives at Y Llan via train, a small town, situated deep in North Wales where the main character grew up (filmed at Blaenau Ffestiniog rail-station).
Travelling from Ireland, and leaving her baby behind, Martha stays with the local primary school's headmaster, Ifor Preis and his wife, Meri.
At a concert held in the school, Martha reveals to the whole village including Meri about the affair, destroying Ifor's status in the community.