The Dalcassians were a Gaelic Irish tribe who rose to prominence specially in the 10th century. They get their name from Cormac Cas of the 3rd century.
Brian Bóru is perhaps the best known king from this tribe – who eventually became High King of Ireland and died in 1014 at the Battle of Clontarf. Following this their fortunes dimished somewhat. Through the 12th–16th centuries, the Dál gCais fell back to their stronghold of the Kingdom of Thomond.
In the 16th century they surrendered their lands – which they then had regranted. Their realm within Thomond was renamed the modern County Clare.
The Dalcassian Tribe provided us with many of the surnames we know today (many of which you will still find in County Clare and Tipperary in great numbers. Names like:
Ahearn, Boland, Casey, Clancy, Considine, Coombe, Crotty, Curry, Durkin, Flattery, Hannon, Hartigan, Heffernan, Hickey, Hogan, Kearney, Kelleher, Kennedy, Kielty, Kileen, Lonergan, MacArthur, MacMahon, MacNamara, MacLysaght, Neylon, Noonan, O’Dea, O’Brien, O’Grady, O’Hehir, O’Meara, O’Reagan, Perkin, Quinn, Shanahan, Sheehan, Tubridy and Twomey.
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