Causantín mac Cináeda

Constantine I ( Causantín mac Cináeda; * 836, † 877) was Scottish king 863-877 and followed Donald I., his uncle.

Although Constantine showed a lot of skill on the battlefield, he often returned to bribery in order to calm his rivals and keep the peace temporarily. This type of peacekeeping was later adopted by the kings of England, in particular of Æthelred II to 1000th

Constantine had a son Donald, who himself came to the throne after the joint reign of Eochaid and Giric as Donald II.