Causantín mac Cináeda
| Causantín | |
|---|---|
c. 1733 Engraving of King Causantín mac Cináeda made by Richard Cooper, the elder | |
| King of the Picts | |
| Reign | 862–877 |
| Predecessor | Donald I |
| Successor | Áed |
| Born | c. 836 |
| Died | 877 possibly Inverdovat, Fife, Scotland |
| Burial | |
| Issue | Donald II, King of the Picts/of Alba |
| House | Alpin |
| Father | Kenneth I, King of the Picts (Cináed mac Ailpín) |
Causantín mac Cináeda (Modern Gaelic: Còiseam mac Choinnich; c. 836-877) was a king of the Picts. He is often known as Constantine I in reference to his place in modern lists of Scottish monarchs, but contemporary sources described Causantín only as a Pictish king. A son of Cináed mac Ailpín ("Kenneth MacAlpin"), he succeeded his uncle Domnall mac Ailpín as Pictish king following the latter's death on 13 April 862. The reign of Causantín likely saw increased activity by Vikings, based in Ireland, Northumbria and northern Britain. He died fighting one such invasion.