 His name is transliterated in Latin as "Thanatus", but his equivalent in Roman mythology is "Mors" or Letum.Mors is sometimes erroneously identified with Orcus, whose Greek equivalent was Horkos, God of the Oath.The Greek poet Hesiod established in his "Theogony" that Thánatos is a son of Nyx (Night) and Erebos (Darkness) and twin of Hypnos (Sleep).