Brian Boru
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Brian Bóruma (born 941, near Killaloe, Ireland—died April 23, 1014, Clontarf, near Dublin) was the High King of Ireland from 1002 to 1014. His fame was so great that the princes descended from him, the O’Briens, subsequently ranked as one of the chief dynastic families of the country.
Brian obtained the name "Bóruma" after his death. It refers to a fort that was in his lands, and is often shortened to "Boru". In life, he was named "Brian mac Cennétig", referring to his father Cennétig.[1]
Brian became High King of Ireland by fighting both other Celtic warlords and Vikings. He's more famous for his battles against the Vikings, as they ended the Vikings' presence in Ireland.[2]