Óttar, the Irish spelling Otir is used, appears as a character in The Summer of the Danes by Ellis Peters in the Brother Cadfael series.
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Owain is a recurring character in the Brother Cadfael series of novels by Ellis Peters, often referred to, and appearing in the novels Dead Man's Ransom and The Summer of the Danes.
Cadwaladr's attempt to reclaim his lands with the help of a Danish fleet in 1144 forms the background to The Summer of the Danes by Ellis Peters in the Brother Cadfael series.