It became the county seat of the Earls of Thomond, descendants of Brian Boru, King of Ireland in 1002.
Pádraig Lucius Ambrose O'Brien, 17th Baron Inchiquin (1900–1982), was an Irish Nobleman and Descendant of Brian Boru.
He assures them that, although he was educated at Oxford, he is thoroughly Irish, and is in fact descended from one of the ancient Irish kings, Brian Boru.
Ulf the Quarrelsome, or Ulf Hreda, is described in Njals Saga as a brother (or sometimes identified as stepson) to Brian Boru, High King of Ireland from 1002 to 1014.
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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 kings that are included range from the almost entirely mythological Labraid Loingsech, who allegedly became High King of Ireland around 431 BC, to the entirely historical Brian Boru.
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.
When Dublin Corporation voted in favour of removing the Pillar in 1931 it declared it a shame that the English hero, and adulterer, held pride of place in the capital city while there was still no statue to Tone, or Brian Boru or Patrick Sarsfield
Sitric's son, Amlaíb Cuarán, aka Óláf Sigtryggsson later succeeded him both as king of Dublin and of York and married the infamous Gormflaith, who was later married to Brian Boru, High King of Ireland.
As early as 1935, St. Marnocks were unable to field a team against Innisfails, who were back playing again, at Brian Boru Park.