Poseidon : 1 of the 12 Olympians
God of the seas, water, storms, hurricanes, earthquakes and horses.

Poseidon and the Winter Solstice
In Greek mythology, the sea god Poseidon is one of the most lascivious of the gods, producing more children than many other gods. Greek calendars varied from polis to polis, but in some Greek calendars, a month around the time of the winter solstice is named for Poseidon.

In Athens and other parts of ancient Greece, there is a month that roughly corresponds with December/January that is named Poseidon for the sea-god Poseidon. Despite the fact that the Greeks were the least likely to sail during these months, they held a celebration in Athens called Posidea to celebrate Poseidon.

https://www.thoughtco.com/greek-winter-solstice-celebrations-120989