Setanta

Setanta is a figure from Irish mythology, most prominently featured in the Ulster Cycle. He is a warrior of the Red Branch Knights of Ulster, known for his martial prowess and his ill-fated love for Emer. Setanta was the son of Súaltam, a chieftain of Ulster, and the sorceress Deichtine, who was the half-sister of King Conchobar mac Nessa. His name is often interpreted as meaning "the one who carries a thunderbolt" or "the swift one."

His most famous tale is the origin of his name. As a young boy, he was traveling to Emain Macha, the capital of Ulster, and was invited to a feast by the blacksmith Culann. Setanta arrived late, and upon entering, was attacked by Culann's fierce hound, which was guarding the smithy. Setanta killed the hound in self-defense. To atone for killing the prized dog, Setanta offered to train and become the guardian of the smithy until a new hound could be raised. Culann, impressed by his bravery and skill, agreed. It was at this point that the druid Cathbad proclaimed that from that day forward, the boy would be known not as Setanta, but as Cú Chulainn, meaning "Hound of Culann."

Cú Chulainn became the greatest hero of Ireland, renowned for his battles against the men of Connacht, particularly his defense of Ulster against the invasion led by Queen Medb in the epic Táin Bó Cúailnge (The Cattle Raid of Cooley). His warrior's frenzy, known as the "Ríastrad," made him a terrifying and near-invincible force in battle. His life was marked by heroism, tragic prophecy, and ultimately, a violent death.