Helike was an ancient Greek polis or city-state that was submerged by a tsunami in the winter of 373 BC.
A Hellenistic-era building, possibly used as a dye-works
The hippocampus, or hippocamp, is a mythological creature mentioned in Etruscan, Greek, Phoenician, Pictish and Roman mythologies, typically depicted as having the upper body of a horse with the lower
Helike
…the philosopher Eratosthenes visited the site and reported that a standing bronze statue of Poseidon was submerged in a "poros", "holding in one hand a hippocamp", where it posed a hazard to those who fished with nets. The meaning of poros in ancient Greek is not fully clear, but could refer to an inland lagoon…
Winged hippocamp in an Art Deco fountain, Kansas City, Missouri, (1937)
Terracotta bell-krater (mixing bowl) with lid, late 5th century BC
Hippocampus in Roman mosaic in the thermae at Aquae Sulis (Bath)
Jonah and the sea monster, from Christian artwork in Roman catacombs at the end of 2nd century A.D. The sea monster drawn by the Roman Christians resembles a hippocampus.