Thetis

Japanese: Thetis

…in Greek legend, he was the greatest hero of the Greek army in the Trojan War. He was the son of Peleus, the Phthian king of Thessaly, and Thetis, the goddess of the sea. As a baby, Thetis, wishing to make her son immortal, immersed him in the river of the underworld, but only his heel, which had been held by his mother's hand, remained alive (Achilles' tendon).

From Peleus

…Antigone committed suicide because of this, and Peleus was plotted by the king to be killed on Mount Pelion, but was saved by the centaur wise man Chiron. In revenge, he killed the queen and destroyed Iolcus. After that, at Zeus's request, he married Thetis, the daughter of the sea god Nereus, and the two gave birth to Achilles. [Tomohiro Mizutani]. …

*Some of the terminology that mentions "Thetis" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…ギリシア伝説で，トロイア戦争におけるギリシア軍最大の英雄。テッサリア地方のフティア王ペレウスPēleusと海の女神テティスThetisとの子。赤子のころ，わが子を不死身にしようと願ったテティスによって冥界の川に浸されたが，母親の手がつかんでいたかかと(踵)だけは生身のままに残った(アキレス腱)。…