Achilles was the greatest of all Greek warriors, a hero of the Trojan War and the central character of Homer’s Iliad. Since he was a half-god, he was very strong and quickly became a fierce warrior. However, he was also half human and wasn't immortal like his mother, Thetis. According to the myths, when he was born, Thetis tried to make him immortal by dipping him in the river Styx. Because she was holding his left heel, it remained vulnerable, later known as "Achilles' heel". He was killed near the end of the Trojan War by Paris, who shot him in his vulnerable spot, with an arrow.