Thalassa is the Protogenos of the Seas and a Daughter of Chaos. She is the physical embodiment of the ocean and has near-limitless power over her domain. When the gods went to war with the titans, she supported the gods. As such, when Poseidon became lord of the seas, Thalassa was invited to live with him in Atlantis. She is given a place of prestige in his kingdom and is one of his most trusted advisors.