Nereus (Gr. Νηρεύς), a marine divinity in classic mythology, was represented as a wise and prophetic old man, and was believed to dwell at the bottom of the sea with his beautiful daughters the Nereids. He was regarded as ruling principally over the iEgean Sea, and was believed occasionally to appear to men in different shapes, predicting what should befall them in the future. The poets feigned that he could assume various forms like Proteus, and would only reveal the future when, having exhausted his powers of transformation, he was reduced to his original shape. Nereus yielded his place to Poseidon, and gave him his daughter Amphitrite. His attribute was the trident. He frequently appears in ancient works of art.