Poseidon

Poseidon is the Greek God of the Sea, earthquakes and horses.

He is brother of Zeus and Hades, the three Olympian sons of Kronos (or the "Big Three".) He is also brother to Hera, Demeter and Hestia.

Birth
Poseidon's parents were the Titans Kronos and Rhea. After he was born, Kronos ate Poseidon and his other siblings (besides Zeus) whole. Rhea took baby Zeus knowing that one day he would become the king of the next generation of gods, and hid him in a Cave. Many Years later, Zeus was a grown man. He tricked Kronos into drinking a mixture of wine and mustard causing him to throw up Poseidon and his other siblings. Because Poseidon and his siblings were immortal, they could not die. Therefore Poseidon was a grown man as well when he was released from Kronos' stomach. Then there was a catastrophic war between the Gods and the Titans. The Gods won the war and each Titan was sentenced to a horrible punishment. Kronos was thrown into the deepest pit in the underworld, Tartarus. Zeus then became King of the Sky and the Gods. Poseidon became the King of the Sea and Hades became King of the Underworld.

Poseidon's Creation of Horses
Poseidon is also the god of horses and all other Horse-type animals such Pegasi and Hippocampi. He is the God of Horses because he created them and all other Horse-type animals out of sea foam.