[1] It is in oil on canvas (114,4 x 146,6 cm) and shows a group of figures in the sea near a beach, with putti flying over their heads.
This mythological scene clearly depicts Poseidon (or Neptune to the Romans), bearded and muscular, with four horses and a trident, to the left.
But it is not clear whether the central female figure, sitting on a shell boat, is intended as Venus, Poseidon's wife Amphitrite, or Galatea.
[1] It seems that the oldest recorded title is il trionfo di Nettunno by Giovanni Pietro Bellori (d. 1698).
[3][1] Raphael's Triumph of Galatea, from which the putto below the central female was directly copied, also seems to have influenced the composition.