Who was the galic leader?

The Gaelic leader often referred to is Brian Boru, who was a prominent king of the Irish who reigned from 1002 until his death in 1014. He is best known for his role in unifying various Gaelic kingdoms and for his victory at the Battle of Clontarf, which was pivotal in resisting Viking invasions. His legacy is celebrated in Irish history, symbolizing resistance and national identity.