The Battle of Strathearn took place in 904 during the reign of Constantine II of Scotland, and arose directly from the turmoil that followed the expulsion of the Vikings from Dublin in 902. The Norse-Gaelic King of Dublin, Ímar ua Ímair, along with other exiled Dubliners, had retreated to territory in Scotland over which they exerted some control. The year before the battle, in 903, they had been engaged in warfare with Constantine, raiding Dunkeld. Sons of Bárid mac Ímair sent a Danish army to attack Strathearn, the fertile valley of the River Earn in what is now Perthshire.
Constantine achieved a decisive victory the following year at a place identified by the Chronicle of the Kings of Alba as Strath Erenn, which is taken to be the same engagement referred to in Strathearn sources as the Battle of Strathearn. The Annals of Ulster record the death of Ímar ua Ímair at the hands of the Picts of Fortriu in this same battle, confirming both the scale of the Scottish victory and the identification of the engagement. The defeat was so decisive that the Kingdom of Scotland was not attacked by Vikings for the next fifty years, and the Vikings did not return to Dublin itself until 917.
The Annals of Ulster record the death of Ímar ua Ímair, King of Dublin, at the hands of the Picts of Fortriu at Strath Erenn in 904, making him among the most prominent Norse-Gaelic leaders to fall in battle against the Scots during this period; the Chronicle of the Kings of Alba identifies this as the same engagement in which Constantine II secured his victory, a triumph so complete that Viking attacks on Scotland ceased for half a century thereafter.
Ímar ua Ímair, King of Dublin, killed in the battle
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