An Irish clan is a traditional social group in Ireland, often linked by kinship and shared ancestry. Clans typically consist of families that trace their lineage to a common ancestor, forming a close-knit community. Each clan has its own unique name, history, and often a specific territory, which they would defend and manage collectively. Historically, clans played a significant role in Irish society, especially during the medieval period. They were governed by a chief, who was usually the most powerful or influential member. Clans like the O'Neills and O'Briens are well-known examples, each with a rich heritage and contributions to Irish culture and history.