/ˈplaɪədiːz/ , also /ˈpliːədiːz/ ), (in Greek , Πλειάδες /pleiˈades/ , Modern /pliˈaðes/ ), companions of Artemis , were the seven daughters of the titan Atlas and the sea-nymph Pleione born on Mount Cyllene . They are the sisters of Calypso , Hyas , the Hyades , and the Hesperides .