Possible Clues:

• House-sitter, first female one since coming to prominence
• Legendary furrier
• Wealthy New York family on HBO's "The Gilded Age"
• New York library sponsor John Jacob
• Former female MP with a tale that never ends
• John Jacob -- (fur king)
• Early American merchant
• "Dodsworth" co-star Mary
• Mary or John Jacob
• Lady who reportedly exchanged barbs with Churchill