Nereus is a figure from Greek mythology, known as the "Old Man of the Sea." He is often depicted as a wise and gentle sea god, associated with the Mediterranean Sea. Nereus is the father of the Nereids, who are sea nymphs that help sailors and are often depicted as beautiful maidens. Nereus is known for his ability to change shape and his knowledge of the past, present, and future. He is often called upon for guidance and is considered a symbol of the sea's nurturing aspects. His character represents the calm and benevolent side of the ocean, contrasting with more chaotic sea deities like Poseidon.