 Artistic and a keen gardener, the new Duchess of Marlborough had enlarged images of her startling blue-green eyes painted on the ceiling of the main portico of Blenheim Palace, where they remain today.Later in their unhappy, childless marriage, she kept a revolver in her bedroom to prevent her husband's entry.As her behaviour became increasingly erratic, most noticeably following the Duke's conversion to Roman Catholicism, the couple began drifting apart.