Peibo Clafrog (alternatively Pepiau Glavorawc or in Latin Pepianus Spumosus) was King of Ergyng in south-east Wales in the 5th or 6th century. He is chiefly known from the legends of Saint Dubricius who was supposedly his grandson. The contemporary rendering of this name would seem to be Peibio as in Garthbeibio a parish in Montgomeryshire or Ynys Beibio near Holyhead.
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