Constantine II was king of Alba from 900 until his abdication in 943 and one of the most important rulers in the formation of the medieval Scottish kingdom. He succeeded during sustained Viking pressure across northern Britain and spent much of his long reign navigating warfare and alliance among Alba, the Norse rulers of Dublin and York, Strathclyde and the expanding West Saxon monarchy. His reign is recorded only intermittently in chronicles, leaving many political details uncertain.
Constantine was defeated by Æthelstan’s forces in the campaign of 934 and later joined the coalition that confronted Æthelstan at the Battle of Brunanburh in 937. The coalition’s defeat did not destroy Alba, and Constantine continued to rule until 943, when he abdicated in favour of Malcolm I and retired to a religious community at St Andrews. He died in 952. His long reign helped preserve Alba through an era in which English and Norse power repeatedly reshaped northern Britain.
Bernard Cornwell’s The Flame Bearer and War Lord, Tim Hodkinson’s Eye of the Raven and M. J. Porter’s King of Kings use Constantine in fiction about the struggle for Britain after Alfred. Porter’s Clash of Kings and Kings of War, together with Michael Livingston’s Never Greater Slaughter, treat the political and military setting of Brunanburh and Constantine’s alliance against Æthelstan.