Irish clans were traditional social groups in Ireland, often based on family ties and shared ancestry. Each clan was typically led by a chieftain and had its own territory, customs, and laws. Clans played a significant role in Irish society, providing support and protection to their members. The most famous Irish clans include the O'Neills, O'Briens, and MacCarthys. These clans often engaged in alliances and conflicts with one another, shaping the political landscape of Ireland. Today, many people trace their heritage back to these clans, celebrating their history and cultural identity.