Thanatos, or Mors, the god of Death and twin brother of Sleep dwelt
in a dark cavern near the entrance to Tartarus. His office was to
introduce all men to the subterranean abode and reveal to them its
secrets. Occasionally he was followed with meekness and submission, but
more often his approach was regarded with fear. He performed his task
with such relentless severity that at the sight of his gloomy figure
men’s hearts trembled and their minds were filled with awful thoughts.