Hero and Leander in Wikipedia

Hero and Leander is a Greek myth, relating the story of Hērō (Greek: Ἡρώ, pron. hay-RAW (ancient) and like "hero" in English), a priestess of Aphrodite who dwelt in a tower in Sestos, at the edge of the Hellespont, and Leander (Greek: Λέανδρος, Léandros), a young man from Abydos on the other side of the strait. Leander fell in love with Hero and would swim every night across the Hellespont to be with her. Hero would light a lamp at the top of her tower to guide his way...