Percy Jackson's Greek Gods

Content Warning: The source text and this section of the guide include discussions of violence and death by suicide. 

As the middle child who is always second to Zeus, Poseidon is neglected but keeps a mostly laid-back attitude. However, when he gets mad, he causes terrific storms and can sink entire islands. After building his underwater palace and establishing himself as a likeable god, Poseidon goes to land to patron a city. He arrives moments after Athena (Zeus’s daughter and the goddess of wisdom), who proposes a contest. She and Poseidon will each create a gift, and based on the gifts, the city will decide which god they want. Poseidon creates horses that people can use for transport and work. Athena gifts them the olive tree, which can be easily grown and used for many products that the city can sell to become rich. Athena wins the patronage, and the city becomes Athens.

After receiving a tiny strip of land to be patron of, Poseidon returns underwater, where he falls in love with a water nymph named Amphitrite, who has no desire to marry. With the help of a dolphin, Poseidon convinces the Nereid to wed him, and the two have three children, including Triton.