Uí Briúin Ai is a historical dynasty that originated in ancient Ireland, specifically in the province of Connacht. It is part of the larger Uí Briúin lineage, which claims descent from Brian Boru, a notable High King of Ireland. The Uí Briúin Ai branch was primarily associated with the region around Roscommon and played a significant role in the local politics and culture during the medieval period. The dynasty was known for its influence and power, particularly in the 10th and 11th centuries. Members of Uí Briúin Ai often held important titles and positions, contributing to the governance of Connacht. Their legacy is reflected in various historical records and archaeological sites throughout the region.