In Greek mythology Thanatos (Mors in Roman Mythology) was the god of death, a son of Night and the twin brother of Sleep. He was frequently regarded with submission, or as coming opportunely, and was represented in the form of a quiet, pensive youth, winged, standing with his legs crossed, often beside an urn with a wreath on it, and holding an extinguished torch reversed. Or, as a personification of endless repose, he appeared in the form of a beautiful youth leaning against the trunk of a tree, with one arm thrown up over his head - an attitude by which ancient artists usually expressed repose. It was probably owing to the spread of the belief that death was a transition from life to Elysium, that in later times this more attractive representation of the god of death took the place of the former repulsive representations, whether as a powerful and violent god, or as a black child in the arms of his mother, Night. Among the figures sculptured on the chest of Cypselas, a description of which we have still in Pausanius, was that of Night carrying twin children in her arms - the one white, representing Sleep, and the other black, representing Death. Research Thanatos