Thanatos

Thanatos (Θανατος) was the Greek god of death. He was associated with non-violent deaths rather than violent deaths which were represented by the Keres. He was a son of Nyx and the twin brother of Hypnos. The touch of Thanatos brought a person a painless death. Thanatos was usually depicted as a winged and older man. He was sometimes holding an inverted torch and wreath or with a butterfly.

In Roman mythology, Thanatos was known as Mors or Letum. Some say he is the Grim Reaper.