He was the son of Rodrem, king of Connacht in Ireland.[2]
Rhwydrys is believed to have built a chapel in Llanrhwydrys on Anglesey in around 570 AD.[3]
St Rhwydrys's Church in Llanrhwydrys is dedicated to him. This church was built in the 12th century on or near his former chapel.
^ abBaring-Gould, Sabine. The Lives of the Saints, Vol. XVI, "The Celtic Church and its Saints", Longmans, Green, & Co. (New York), 1898.Vol. I, p. 75.
^Genealogy of the Saints (Continued) The Cambro-Briton Vol. 3, No. 29 (May, 1822), pp. 394–396