Final answer:
Poseidon is the Greek god who rules over the sea. He is often called the Earth-Shaker and is known for his trident. Poseidon gave horses to mankind as a gift.
Step-by-step explanation:
Poseidon is the Greek god who rules over the sea. He is also known as Neptune in Roman mythology. Poseidon's wife is the goddess Amphitrite. He is frequently called the Earth-Shaker because he has the power to cause earthquakes.
Poseidon lives in a palace under the sea called Atlantis. He is often depicted riding a chariot pulled by sea horses or holding a trident, which is a three-pronged spear. The trident is a symbol of Poseidon's power and control over the sea.
As a gift to mankind, Poseidon gave them horses. In Greek mythology, it is said that he created the first horse by striking a rock with his trident.