Tristie is the personification of sorrow. The myth she is best known for is Eros & Psykhe. She along with Sollikito (Melancholy) called by Aphrodite to whip and beat Psykhe when Psykhe enters the abode of Aphrodite.
"'Where are my maids Sollicito (Melancholy) and Tristie (Sorrow)?' They were called in, and the goddess consigned Psyche to them for torture. They obeyed their mistress's instruction, laid into poor Psyche and tortured her with other implements"
- Apuleius, The Golden Ass