The mother of Achilles in Greek mythology is Thetis, a sea nymph. Thetis plays a crucial role in Achilles's life, often intervening to protect him from his fate during the Trojan War. Her attempts to make him invulnerable, such as dipping him in the River Styx, highlight the themes of divine intervention and the relationship between mortality and the pursuit of glory in war. Thetis's love represents a deep maternal bond that influences epic events.