Poseidon
Poseidon is the god of the sea and the protector of all waters. He is the brother of Zeus. After the overthrow of their Father, Cronus, he drew lots with Zeus and Hades, another brother, for shares of the world. His prize was to become lord of the sea. The seamen worshipped him. He married Amphitrite, who was a granddaughter of the Titan, Oceanus.
At one point he desired Demeter. To put him off, Demeter asked him to make the most beautiful animal that the world had ever seen. So to impress her, Poseidon created the first horse. His first attempts at making the horse were unsuccessful. He created a bunch of other animals in the process . By the time the horse was created his love for Demeter had dimmed.
His weapon is a trident, which can shake the earth, and shatter any object. Zeus is the only God that is more powerful than him. He was greedy and had a series of disputes with other gods when he tried to take over their cities.