A far fetched, riddlesque hint: Gilda.
Charles Foster Kane was played by Orsen Wells who was married to Rita Hayworth, who played Gilda. Yeap, a far fetched, riddlesque hint, but it worked.
Xanadu was Charles Foster Kane's house in Citizen Kane
"Today, almost as legendary is Florida's XANADU - world's largest private pleasure ground. Here, on the deserts of the Gulf Coast, a private mountain was commissioned, successfully built for its landlord. Here in a private valley, as in the Coleridge poem, "blossoms many an incense-bearing tree." Verily, "a miracle of rare device."