Grace Kelly was not the first American blue-blood to marry Monegasque royalty. And she was Jewish marrying two blue-bloods in the era of the Dreyfus affair.
According to her Wikipedia article, "Her first husband was the Duke de Richelieu and one of the titles of her second husband was the Duke de Mazarin; she was thus unique in bearing the titles of both Cardinal Richelieu and Cardinal Mazarin...She brought a strong business acumen, showing an understanding far beyond her years. Having helped put her husband's principality on a sound financial footing, she would devote her energies to making Monaco one of Europe's great cultural centers with its opera, theater, and the ballet under the direction of the famed Russian impresario, Sergei Diaghilev."
