Achilles was the greatest warrior in Homer's Iliad. He was the son of the water nymph Thetis and was dipped in the River Styx as a child, which made him invulnerable everywhere except for his heel. Achilles had an excessive pride that caused him to refuse to fight in the Trojan War at first. He was known for his rage and arrogance on the battlefield. After killing Hector, he dragged the body behind his chariot. Achilles' relationship with Briseis and his death of Patroclus drove much of his actions in the war.