MacCarthy Mor is a title historically held by the rulers of the MacCarthy dynasty in County Cork, Ireland. The title translates to "Great MacCarthy" and signifies the head of the family, which was one of the most powerful Gaelic clans in the region during the medieval period. The MacCarthy family played a significant role in Irish history, particularly in the context of the Desmond Rebellions against English rule. The title has been passed down through generations, and today, it is associated with the preservation of Irish heritage and culture.