The Uí Néill was a powerful dynasty in early medieval Ireland, known for its significant influence over the northern regions. The name translates to "descendants of Niall," referring to Niall of the Nine Hostages, a legendary king who lived in the 5th century. The dynasty played a crucial role in the formation of early Irish kingdoms and was instrumental in the spread of Christianity in Ireland. The Uí Néill were notable for their leadership and military prowess, often engaging in conflicts with rival clans. They produced many high kings of Ireland, including Brian Boru, who is one of the most famous figures in Irish history. Their legacy is evident in the numerous place names and historical records associated with their rule.