Saint Deiniol (died 584) was the first Bishop of Bangor in the Kingdom of Gwynedd, Wales. He is also venerated in Brittany as Saint Denoual. In English, the name is translated as Daniel but this is rarely used.
Very little is known of the saint's life, but the tradition that he was the first Bishop of Bangor is very strong. He was apparently consecrated in 545 by Saint David. The present Bangor Cathedral is dedicated to Deiniol and is said to be on the site where Deiniol's first monastery stood. His feast day is September 11.
Icon reproduced with kind permission of the iconographer, Aidan Hart.