Alpin

Alpin (dates uncertain, death c.840CE) was the son of the King of the Scots kingdom of Dalriada, Eochaid IV (known as "the Venomous"). His earlier namesake was also the son of an Eochaid (III), but lived about a century earlier.
This Alpin's fame arises from the fact that his son Kenneth I took the kingship of Dalriada, conquered or subdued the other Scottish kingdoms and ruled as king of Scotland or Alba, over Picts, Scots and the Scots Angles, and that he named his house after his father.