 On 11 May 1920, he married Lady Cynthia "Cimmie" Curzon (1898–1933), second daughter of the 1st Earl Curzon of Kedleston, (1859–1925), Viceroy of India, 1899–1905, Foreign Secretary, 1919–1924, and Lord Curzon's first wife, the U.S. mercantile heiress, the former Mary Leiter.Lord Curzon had to be persuaded that Mosley was a suitable husband, as he suspected Mosley was largely motivated by social advancement in Conservative Party politics and Cynthia's inheritance.The 1920 wedding took place in the Chapel Royal in St James's Palace in London – arguably the social event of the year.