9th-century Welsh bishops

Asser (; ; died 909) was a Welsh monk from St David's, Dyfed, who became Bishop of Sherborne in the 890s. About 885 he was asked by Alfred the Great to leave St David's and join the circle of learned men whom Alfred was recruiting for his court. After spending a year at Caerwent because of illness, Asser accepted.

Elfodd, Elvodug or Elfoddw ( or Elbodius; died 809) was a Welsh bishop. He is credited with inducing the Welsh church to accept the Roman computus for determining the date of Easter endorsed elsewhere in Britain at the Synod of Whitby in 664. This was after centuries of continuing the practice.