Welsh monk and possibly bishop.
Trained at Llantwit, he eventually became abbot of Bardsey. He is the patron of Aberdaron on the Lleyn peninsula, where pilgrims used to embark for Bardsey. His feast is in no ancient calendars known to Baring-Gould, but wakes were held in his honour at Aberdaron on 1 or 6 January. Churches in Bristol, Gloucester, and Hereford, dedicated to Ewen, have been dubiously claimed as his.
Baring-Gould and Fisher, iii. 263–5.