Fergus mac Róich is a legendary figure from Irish mythology, known for his role in the epic tales of the Ulster Cycle. He was a warrior and king of Ulster, often depicted as a powerful and charismatic leader. Fergus is notable for his complex character, embodying both strength and vulnerability, and he plays a significant role in the stories surrounding the hero Cú Chulainn. In the myths, Fergus is often portrayed as a former king who, after being exiled, becomes a key ally to the Táin Bó Cúailnge (The Cattle Raid of Cooley). His adventures and conflicts highlight themes of loyalty, honor, and the struggles of leadership in a tumultuous time.