Early British Kingdoms
Biography of St. Beuno of Clynnog Fawr, uncle of St. Winifred, who died on 21st April AD 640.

Catholic Online
Very brief profile of St. Beuno.

For All the Saints
Hagiography of St. Beuno, also called Beunor. Includes legendary material.

Catholic Encyclopedia
St. Beuno, Welsh, said to have been educated at Bangor and, after ordination, to have become a missionary. Abbot of Clynnog, and uncle of St. Winifred. Died perhaps in 660. Feast day: 21 April.