Proto is the Nereid of the "first" voyage. Other than being listed among the Nereides not much is known.
And of Nereus and rich-haired Doris, daughter of Ocean the perfect river, were born children, passing lovely amongst goddesses, Ploto, Eucrante, Sao, and Amphitrite, and Eudora, and Thetis, Galene and Glauce, Cymothoe, Speo, Thoe and lovely Halie, and Pasithea, and Erato, and rosy-armed Eunice, and gracious Melite, and Eulimene, and Agaue, Doto, Proto, Pherusa, and Dynamene, and Nisaea, and Actaea, and Protomedea, Doris, Panopea, and comely Galatea, and lovely Hippothoe, and rosy-armed Hipponoe, and Cymodoce who with Cymatolege and Amphitrite easily calms the waves upon the misty sea and the blasts of raging winds, and Cymo, and Eione, and rich-crowned Alimede, and Glauconome, fond of laughter, and Pontoporea, Leagore, Euagore, and Laomedea, and Polynoe, and Autonoe, and Lysianassa, and Euarne, lovely of shape and without blemish of form, and Psamathe of charming figure and divine Menippe, Neso, Eupompe, Themisto, Pronoe, and Nemertes who has the nature of her deathless father. These fifty daughters sprang from blameless Nereus, skilled in excellent crafts. And Thaumas wedded Electra the daughter of deep-flowing Ocean, and she bore him swift Iris and the long-haired Harpies, Aello (Storm-swift） and Ocypetes （Swift-flier） who on their swift wings keep pace with the blasts of the winds and the birds; for quick as time they dart along.
- Hesiod, Theology 240