 In the current Roman Catholic liturgical calendar for Wales, he is commemorated on 20 April, the 21st being designated for Saint Anselm.His name has been reconstructed as "*Bou[g]nou" in Old Welsh, with a proposed derivation from the common Celtic *"Bou[o]-gnāw-", with a meaning related to "Knowing Cattle".Beuno was said to have been born at Berriew in Powys and to have been the grandson of a prince of the local dynasty, which descended from Vortigern, king of Britain.