Camillo Benso, Count of Cavour
The "Pavilion of the Princes" at Plombières, was renamed following the meeting on 21 July 1858 between Napoleon III and Camillo Benso, Count of Cavour, who secretly negotiated the “Plombières Agreement” as they sat alone together in a small horse-drawn carriage slowly progressing round and round the town. This accord granted French aid to the cause of Piedmont-Sardinia against the Austrian Empire in return for the territories of Savoy and Nice, which thereafter became French.