The O'Brien Clan is a prominent Irish family with roots tracing back to the 10th century. They are descendants of Brian Boru, a famous High King of Ireland who played a significant role in the country's history. The clan's ancestral lands are primarily located in County Clare, where they have a rich cultural heritage. Throughout history, the O'Briens have been influential in Irish politics and society. They were known for their leadership and military prowess, particularly during the Norman invasion of Ireland. Today, the O'Brien name remains common in Ireland and among the Irish diaspora worldwide.