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Ruadrí o Mar is the first kent Mormaer o Mar frae the 12t century, awtho that the mormaerdom wis hintle aulder. For instance, thare wis a Mormaer o Mar at the Battle o Clontarf, 1014.
He is mentioned as Ruadrí mormar Marr in the Gaelic notes on the Book of Deer. This means his floruit dates a little efter 1130.