Amlaíb disappears from Irish annals after his return to Ireland in 871. According to the Chronicle of the Kings of Alba he was killed by Constantine either in 871 or 872, when he returned to Pictland in an attempt to collect further tribute. Late sources of uncertain reliability state that Auisle was killed by Amlaíb in 867 in a dispute over Amlaíb's wife, the daughter of a Cináed (Kenneth). It is unclear whether, if accurate, this woman should be identified as a daughter of Kenneth MacAlpin, and thus Constantine’s sister, or as a daughter of Cináed mac Conaing, king of Brega, a petty Kingdom north of Dublin in Ireland.
In 875 a Viking army was once again present in Pictland and a battle, fought near Dollar in Clackmannanshire, resulted in a heavy defeat for the Picts. In 877, shortly after building a new church for Culdees monks at St Andrews, Constantine was captured and executed (or perhaps killed in battle) after defending against Viking raiders. According to some sources, his execution took place on a beach, though the exact loation is not known. He was buried on Iona and was succeeded by his brother Áed.
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