Causantín or Constantín mac Cináeda (died 877), wis a king o the Pechts. He is aft kent as Constantine I, in reference tae his place in modren lists o kings o Scots, tho contemporary soorces descrived Constantín anerly as a Pechts king. A son o Kenneth MacAlpin, he succeeded his uncle Donald I as Pechts king follaein the latter's daith on 13t Aprile 862. Constantine's ring witnessed increased activity by Vikings, based in Ireland an Northumbria, in northren Breetain an he deed fechtin ane sic invasion.
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