Old chronicles describe Kilmainham Hill as the camping place of Brian Boru and his army prior to the last decisive Battle of Clontarf on 23 April 1014.
The tale is a fictionalized version of the Battle of Clontarf recast in Howard's views, with doomful vision and fantasy elements.
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Several historians have proposed instead that in early times, and certainly as late as the Battle of Clontarf in 1014, Laithlinn refers to the Norse and Norse-Gael lands in the Hebrides, the Isle of Man, the Northern Isles and parts of mainland Scotland.
Duggan is supposed to have been a direct descendant of Mogh Ruith and a Duggan, King of Fermoy, was one of Brian Boru's lieutenants to be killed at the battle of Clontarf.
The marriage of "Eithne, daughter of King Kjarval of Ireland" and Hlodvir Thorfinnsson, Earl of Orkney is reported in the Orkneyinga saga and Earl Sigurd the Stout, who was killed at the battle of Clontarf is called their son.
The Irish doom metal group Mael Mórdha take their name from Máel Mórda mac Murchada and many of their songs are based on the events of the battle of Clontarf.