Antoinette de Merode (Antoinette Ghislaine; 28 September 1828 – 10 February 1864), Princess of Monaco, was born in Brussels as the daughter of Count Werner de Merode (1797-1840) and his spouse, Countess Victoire de Spangen d'Uyternesse (1797–1845).

On her eighteenth birthday on 28 September 1846 in Brussels, she married Charles III, Prince of Monaco. It was a double wedding with her older sister, Louise.

Thanks to her generous dowry, Prince Charles III was able to finance the embellishment of Monte Carlo in order to attract wealthy tourists to the principality. She acquired for herself the Château de Marchais, which is still the property of the Grimaldi family today.

On 13 November 1848, she gave birth in Paris to Albert I, Prince of Monaco. From 1856 until her death in 1864, she was the Princess consort of Monaco.

She was the sister of Louise de Mérode and aunt of Maria Vittoria dal Pozzo, for three years Queen of Spain. Antoinette de Merode died on 10 February 1864 in Paris (aged 35) and was interred in the Saint Nicholas Cathedral, Monaco.

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