Lethe (i.e. oblivion), in the Greek mythology a stream in the nether world, a draught of the waters of which, generally extended to the ghosts of the dead on their entrance into Pluto's kingdom, obliterated all recollection of the past and its sorrows.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
L'Estrange, Sir Roger * Leto