Poseidon

Poseidon is the Greek god of the sea, storms, and creator of horses. His Roman name is Neptune, and he is usually thought of the moodiest and grumpiest Olympian god-and since he, like Ares, is so grumpy most of the time, it has turned into one of his major weaknesses. He plays a major role in the series Percy Jackson and the Olympians. Being one of the "Big Three" eldest gods, he is now forbidden to have children. But his brothers, Zeus and Hades, fell off the wagon and had children, without telling one another that they broke their own oath. Poseidon, too, also broke it by having Percy-but all three gods soon found out the others broke it too. His most famous son is probably Theseus, the hero that fought the Minotaur. Though, like Zeus, he has been "disloyal" to his first wife, Amphitrite, he makes up for it. Luckily, Amphitrite is not Hera, and she doesn't mind Poseidon having children with other women as long as he is still has unwavering loyalty to her.