Thetis

In Greek mythology, the most beautiful Nereid (a sea goddess), and mother of Achilles. She dipped the baby in the Styx, rendering him invulnerable except for the heel which she held. In Homer's Iliad she also gave Achilles armour forged by Hephaestus. Fated to have a son more powerful than his father, she was married by the gods against her will to a mortal, Peleus.

She attempted to avoid him by changing into a bird, a tree, and finally a tiger, but was unable to escape his embrace. At their wedding, a golden apple was thrown down by Eris, the personification of strife, as a prize for the most beautiful goddess present. Disputed by Aphrodite, Athena, and Hera, the Trojan Paris was called to give a judgement, and his choice of Aphrodite in return for the love of Helen resulted in the Trojan wars.