The Dalcassians were a Gaelic people from the region of County Clare in Ireland. They are known for their rich cultural heritage and contributions to Irish history, particularly during the early medieval period. The Dalcassians were part of the larger Éoganachta dynasty and played a significant role in the formation of various kingdoms in the area. One of the most notable figures associated with the Dalcassians is Brian Boru, who became the High King of Ireland in the early 11th century. Under his leadership, the Dalcassians gained prominence and influence, particularly in their efforts to unify Ireland against Viking invasions. Their legacy continues to be celebrated in Irish culture and history.