<P> 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 . 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 . Poland remained partitioned among Russia, Prussia and Austria, with the largest part, the newly created Kingdom of Poland, remaining under Russian control . </P> <P> The arrangements made by the Four Great Powers sought to ensure future disputes would be settled in a manner that would avoid the terrible wars of the previous 20 years . Although the Congress of Vienna preserved the balance of power in Europe, it could not check the spread of revolutionary movements across the continent some 30 years later . </P>

Who is called the centre of power in the vienna conference