She has her very own Holy Well at the place named after her: Llanenddwyn in Gwynned, Wales.
This is where she happened upon a well which, when immersed in its water, healed her of a ‘sore disease’.
When word of this got out, folk flocked to the well to have their warts and all cured. The lame walked, the blind saw, and soon the place was littered with abandoned crutches, walking sticks and guide dogs.
ENDDWYN, of course, was elevated to Saint status almost immediately. Nothing else is known about her, and even her gender and feast day are open to question.
However, we understand the well is still deemed to be good for eye ailments and curing ‘kings evil’.