Bri·an Bo·ru 
(brīən bə-r, bô-rō, brēn) 926-1014.
(brīən bə-r, bô-rō, brēn) 926-1014. Irish king (1002-1014) who spent most of his life fighting the Danes and the Norse. He was killed after the final defeat of a Danish coalition, which ended Norse power in Ireland.