According to wikipedia:
In Greek mythology, Thanatos (/ˈθænətɒs/;[3]Ancient Greek: Θάνατος, pronounced in Ancient Greek: [tʰánatos] “Death“,[4] from θνῄσκω thnēskō “(I) die, am dying”[5][6]) was the personification of death. He was a minor figure in Greek mythology, often referred to but rarely appearing in person.
His name is transliterated in Latin as Thanatus, but his counterpart in Roman mythology is Mors or Letum.
The Greek poet Hesiod established in his Theogony that Thánatos has no father, but is the son of Nyx (Night) and brother of Hypnos (Sleep).[7]
The god’s character is established by Hesiod in the following passage of the Theogony:
And there the children of dark Night have their dwellings, Sleep and Death, awful gods. The glowing Sun never looks upon them with his beams, neither as he goes up into heaven, nor as he comes down from heaven. And the former of them roam peacefully over the earth and the sea’s broad back and is kindly to men; but the other has a heart of iron, and his spirit within him is pitiless as bronze: whomsoever of men he has once seized he holds fast: and he is hateful even to the deathless gods.[7]
Thanatos was thus regarded as merciless and indiscriminate, hated by – and hateful towards — mortals and gods alike.
タナトス（古希: Θάνατος, Thanatos）は、ギリシア神話に登場する死そのものを神格化した神。
夜の女神ニュクスが一柱で生んだ息子[1]、または幽冥の神エレボスと夜の女神ニュクスの息子[2][3]。眠りの神ヒュプノスと双子の兄弟である[4]。
ローマ神話の死神モルス（ラテン語: Mors）やレトゥム（ラテン語: Letum）と同一視される。
タナトスを「亡者の王」や「ハーデース（同一視として）」と呼ぶ事もある[5]。
概念的な存在で、古くはその容姿や性格は希薄であったが、次第に柔和で優しいヒュプノスに対してタナトスは鉄の心臓と青銅の心を持つ非情な神で人間にとっても神々にとっても忌むべき者となった[6]。
姿は有翼[7]で剣を持ち[8]、黒い服を着た[5]蒼ざめた老人であるとも[9]、ヒュプノスによく似た青年であるともいわれる[10]。
寿命を迎える人間の髪を剣で一房切り取り、冥王ハーデースに捧げ魂を冥界に連れて行き冥界の住民とする[8]。英雄の魂はヘルメースが冥府に運び、凡人の魂はタナトスが冥界へ運ぶともされる。
太陽はタナトスとヒュプノスの姿を見ようとはせず、彼らは大地の遥か下方の奈落タルタロスの領域に館を構えて住んでいる[11]。または、冥界の門の近くにあるオネイロスたち（夢）が絡まるニレの巨樹の周りにタナトスとヒュプノスは住むという[12]。
以上は、wikipediaから。
whomsoever: 誰でも