Possible Clues:

• "__ and the Swan": Rubens painting
• Moon of Jupiter discovered in 1974
• Mythological subject for Leonardo, Correggio and Rubens
• Wife of Tyndareus
• '___ and the Swan' (Yeats poem)
• Woman seduced by Zeus in the form of a swan
• Mythological female in terrible danger
• Mother of twins and Head of Broadcasting
• '__ and the Swan': Rubens painting
• Mother of Castor, Pollux, and Helen of Troy