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In page Congress of Vienna:

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Before the opening of the Paris peace conference of 1918, the British Foreign Office commissioned a history of the Congress of Vienna to serve as an example to its own delegates of how to achieve an equally successful peace.[4] Besides, the main decisions of the Congress were made by the Four Great Powers and not all the countries of Europe could extend their rights at the Congress. The Italian peninsula became a mere "geographical expression" as divided into seven parts: Lombardy–Venetia, Modena, Naples–Sicily, Parma, Piedmont–Sardinia, Tuscany, and the Papal States under the control of different powers.[5] Poland remained partitioned between Russia, Prussia and Austria, with the largest part, the newly created Kingdom of Poland, remaining under Russian control.[citation needed]