Thanatos Personification of death and the son of Nyx and the brother of sleep and even the gods hated him. Thanatos ("Death") Thanatos often accompanied his twin brother Hypnos, and the two of them lived in a cave along the river Lethe. When the Fates cut the thread of a person's life, Thanatos would claim the spirit as his own. Sisyphus, however, imprisoned the god when he came for him, and no one died until Ares released him.  In art, he was pictured as a young winged man with a sword and an extinguished or inversed torch.

   Hypnos ("Sleep") Greek god of sleep and the son of Nyx. Hypnos often accompanied his  twin brother Thanatos,  He would send mortals and gods alike to sleep by sprinkling water from the river Lethe with a branch or pouring juices from a horn onto their eyes. It is said that he allowed Endymion to sleep with his eyes open so that the shepherd could look upon his beloved Selene( thus illustrating the compassionate nature of Death and reflecting the promise that, upon death we will be reunited with those who have gone before).  Lethe ("Oblivion") Personification of oblivion and the daughter of Eris. Lethe was also a river in the Underworld from which souls would drink to forget their past lives before being reborn. The brothers Hypnos and Thanatos lived in a cave along the river, and Hypnos would sprinkle water from it onto the eyes of those he sent to sleep.

I was born By my father, the lord, out of the wonderful light. The youngest angel I was probably reckless....That is probably why I was able to get the handful of Dirt the Lord Required to make man...Because I was able to do that (something Michael and Gabriel couldn't do) The Lord gave the important duty to be the Angel of Death..

   Angel of Death-in rabbinic writings there are at least a dozen angels of death: Adriel, Apollyon-Abaddon, Azrael, Gabriel (as guardian of Hades), Hemah, Kafziel, Kezef, Leviathan, Malach ha-Mavet, Mashhit, Metatron, Sammael (Satan), Yehudiah (Yehudiam), Yetzer-hara. In Falasha lore the angel of death is Suriel. In Christian theology, Michael is the angel of death who "leads souls into the eternal light" at the yielding up of the ghost of all good Christians. The Arabic angel of death is Azrael. He is also Iblis, as in the Arabian Nights tale, "The Angel of Death with the Proud King." The Babylonian god of death is Mot. According to Sch6nblum, Pirke Rabbenu ha-Kadosh, there are 6 angels of death: Gabriel (over the lives of young people), Kafziel (over kings), Meshabber (over animals), Mashhit (over children), Af (over men), Hemah (over domestic animals). The angel of death is not necessarily an evil or a fallen angel. He remains at all times a legate of God and in God's service. [Rf Talmud Baba Metzia, 86a.] In Zoroastrianism, the angel of death or the demon of death is Mairya (male or female), who offered Zoroaster the empire of the world [Cf Satan tempting Jesus; see also Saltus, Lords of the Ghostland, chap. on Ormuzd]. In the Apocalypse of Baruch there is an angel of death, unnamed, who makes his first appearance in that work. [Rf Smith, Man and his Gods.] In Ginzberg, The Legend of the Jews IV we read Elijah fighting and overcoming the angel of death. There is also a legend about Aaron seizing the angel of death and locking him in the Tabernacle "so that death ceased." The seizure nmst have been short lived. (The Aaron legend may have inspired the popular Broadway play, Death Takes a Holiday.) This angel of death was most likely Kezef, as suggested in Targum Yerushalmi. The great whale or crocodile of Biblical lore, Leviathan (along with Rahab), is also identified as an angel of death, according to various rabbinic sources. In Talmud Abodah Zarah, 20, the angel of death, Sammael, is described as "altogether full of eyes; at the time of a sick man's departure he [the angel] takes his stand above the place of his [the sick man's] head, with his sword drawn and a drop of poison suspended on it." To Eisenmenger (Traditions of the Jews) the supreme angel of death is Metatron, whose subordinates are Gabriel and Sammael. In his Book of Beliefi and Opinions, Saadiah Gaori (10th century) says that "our teachers have informed us that the angel sent by God to separate body from soul appears to man in the form of a yellowish flame, full of eyes shining with a bluish fire, hold- ing in his hand a drawn sword pointed at the person to whom death is coming." Saadiah then, goes on to suggest a parallel or affinity with the "angel of the Lord" in I Chronicles 21:16 who( stands "between the earth and the heaven, having a drawn sword in his hand stretched over Jerusalem." The angel who would qualify here, so much in the description of him as in relation his office, is the benevolent angel of death, (q.v.). Over 6 persons the angel of death has power (says Talmud Baba Barbra, fol. 17), to wit: Abraham, Isaac, Jacob, Moses, Aaron, and Miriam. With regard to Jacob, it is said that not the angel of death ended his life, but the Shekinah took his soul with a kiss"; and that Miriam also "breathed her last in this manner." A rabbi (ben Levi) outwitting the angel of death is the subject of Long- fellow's poem "The Spanish Jew's Tale."

-Gustav Davidson the Dictonary of Angels