Camillo Benso, Count of Cavour
On 21 July 1858 in Plombières-les-Bains, Vosges, the prime minister of the Kingdom of Sardinia, Camillo Benso, Count of Cavour, met in secret with Napoleon III to secure French military support against the Austrian Empire during the conflicts associated with the Italian unification. During the discussion, Cavour promised that Sardinia would cede the County of Nice and Duchy of Savoy to the Second French Empire. Though this was a secret arrangement, it quickly became widely known.