Alexander Graham Bell's fiancée Mabel Hubbard was the indirect source of the Bell Telephone Company's early commercial success after his creation of the telephone. The U.S. Centennial Exposition in Philadelphia in 1876 brought Bell's newly invented telephone international attention. Exhibition judges Emperor Dom Pedro II of the Empire of Brazil and the eminent British physicist William Thomson (Lord Kelvin) recommended his device to the Committee of Electrical Awards, which voted Bell the Gold Medal for Electrical Equipment, helping to propel him to international fame. Bell also won a second Gold Medal for his additional display at the exposition, Visible Speech —developed earlier by his equally famous father Alexander Melville Bell.