In Greek mythology, Plouto or Pluto (Ancient Greek Πλουτώ) is the sparsely attested mother of Tantalus, usually by Zeus. Hyginus and Pausanias preserve her place at the head of the Sipylian and Atreid genealogies; she has little independent myth beyond that maternal role and a few late associations with Phrygia.
Adapted from Wikipedia, "Pluto (mother of Tantalus)" · CC BY-SA 4.0
I.Family
Most sources make Plouto the mother of Tantalus by Zeus. A scholion on Euripides' Orestes names Tmolos as the father instead. Hyginus gives her father as Himas; other notices make her a daughter of Cronus, and the Clementine Recognitions call her Plutis or Plute, daughter of Atlas.
Through Tantalus she stands at the maternal head of Pelops' line and thus of the Atreid dynasty. Pausanias, identifying the grave on Mount Sipylus as that of Tantalus son of Zeus and Pluto, repeats the same parentage.
II.Mythology
Hyginus opens the Tantalid genealogy by naming Tantalus as the son of Jupiter and Pluto but gives her no independent episode. Nonnus, calling her "Berecyntian Pluto," associates her with Mount Berecyntus in Phrygia sacred to Cybele; in the Dionysiaca Zeus hurries to her bed to sire Tantalus and hides his thunderbolts in a cave that Typhon later steals.
Beyond genealogy and this late Phrygian colouring she remains a shadowy figure: the nymph or heroine through whom Zeus fathers the founder of the Sipylian house.
III.Homonyms
This atlas entry (plouto) is the mother of Tantalus. She is distinct from Pluto/Hades the underworld god, from the Oceanid Pluto, and from the dwarf planet and other modern namesakes that share the English form Pluto.