In Greek mythology, Lethe was one of five rivers in the underworld, as well as the name of a spirit associated with the river. The spirit Lethe was the spirit of forgetfulness and oblivion, and drinking the water of the river caused forgetfulness. The Lethe River was portrayed in the Divine Comedy as a river in Purgatory, which Dante drank from to wipe memories of sin from his mind, preparing him to enter Heaven.
Lethe is also the Greek goddess of Oblivion.
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