Poseidon

Poseidon (Neptune in Roman Mythology) was the ruler of the sea, Zeus's brother, and second only to him in eminence. The Greeks on both sides of the Aegean were seamen and the God of the sea was all-important to them. Poseidon's wife was Amphitrite, a granddaughter of of the Titan Ocean. Poseidon had a palace under the sea, but was more commonly found in Olympus. Storm and calm were under his control.

Poseidon gave the first horse to man, and he was honored as much for the one as for the other.

He was commonly called "Earth-Shaker" and was always portrayed carrying his trident, which he would shake and shatter whatever he pleased. Poseidon had some connection with bulls as well as horses, but the bull was connected with many other gods, too.