Leander and Hero were the mythical lovers that drowned in the Hellespont.
Hero
Leander
Her name was Hero.
Hero's lover was Leander, who was known for swimming across the Hellespont every night to visit her. Tragically, Leander drowned during one of his nightly swims, leading Hero to throw herself into the sea in grief.
You are thinking of Hero, who was the Priestess of Aphrodite.
The stormy winds blew out the torch that Hero held to guide Leander to her across the Hellespont. He lost his way and was drowned. When Hero saw his dead body she threw herself into the sea to be with him.
Isaac Jackman has written: 'Hero and Leander'
Karlheinz Kost has written: 'Musaios Hero und Leander'
Leander swam the Hellespont nightly.
Carl Robert Zache has written: 'Hero and Leander' -- subject- s -: Accessible book
Shakespeare quoted Marlowe's Hero and Leander, in the line "Whoever lov'd that lov'd not at first sight?"