Neleus

Neleus was the son of Poseidon and Tyro, wife of Cretheus. He was the brother of Pelias and half-brother of Aeson, Pheres and Amythaon. As Tyro's sons with Poseidon were born out of wedlock, she exposed them on a mountain, but they were found and raised by a maid.

When they reached adulthood, Pelias and Neleus found their mother Tyro and then killed her stepmother, Sidero, for having mistreated her. Sidero tried to hide in a temple to Hera but Pelias killed her anyway, causing Hera's undying hatred of Pelias. Neleus and Pelias fought for the crown of Iolcus, and Neleus was banished to Messenia, becoming the King of Pylos.

With his wife he had four children, Pero, wife of Bias, king of one third of Argos and her cousin, Pericylmenus, a son gifted with the ability to shapeshift by his grandfather, Alastor and Nestor.

When Heracles came to Pylos, he approached Neleus and asked him to absolve the hero of a blood-debt. Neleus refused and, in rage, Heracles killed all the family but Nestor, who succeeded his father to the throne.