Ruadrí, Earl of Mar
Ruadrí of Mar is the first-known "mormaer", or earl, of Mar from the 12th century, although the mormaerdom was much older. For instance, there was a mormaer of Mar at the Battle of Clontarf, 1014. He was a witness to a confirmation of lands to the newly established Abbey of the Holy Trinity at Dunfermline, by David I in 1128. He is mentioned as "Ruadrí mormar Marr" in the Gaelic notes on the "Book of Deer". This means his floruit dates a little after 1130.