Here is part of an article from the Encyclopedia Britannica Online (you may have access to this via your local library Web site)
assembly in 1814–15 that reorganized Europe after the Napoleonic Wars. Having begun in September 1814, five months after Napoleon's first abdication, it completed its “Final Act” in June 1815, shortly before the Waterloo campaign and the final defeat of Napoleon. The settlement was the most comprehensive treaty that Europe had ever seen.
Austria, Prussia, Russia, and Great Britain, the four powers chiefly instrumental in the overthrow of Napoleon, had concluded a special alliance among themselves with the Treaty of Chaumont, on March 9, 1814, a month before Napoleon's first abdication. The subsequent treaties of peace with France, signed on May 30 not only by the “four” but also by Sweden and Portugal and on July 20 by Spain, stipulated that all former belligerents should send plenipotentiaries to a congress in Vienna. Nevertheless, the “four” still intended to reserve the real making of decisions to themselves. Two months after the sessions began, however, Bourbon France was admitted to the “four.” The “four” thus became the “five,” and it was the committee of the “five” that was the real Congress of Vienna.
Representatives began to arrive in Vienna toward the end of September 1814. Klemens, prince von Metternich, principal minister of Austria, represented his emperor, Francis II. Tsar Alexander I of Russia directed his own diplomacy. King Frederick William III of Prussia had Karl, prince von Hardenberg, as his principal minister. Great Britain was represented by its foreign minister, Viscount Castlereagh. When Castlereagh had to return to his parliamentary duties, the Duke of Wellington replaced him, and Lord Clancarty was principal representative after the duke's departure. The restored Louis XVIII of France sent Talleyrand. Spain, Portugal, and Sweden had only men of moderate ability to represent them. Many of the rulers of the minor states of Europe put in an appearance. With them came a host of courtiers, secretaries, and ladies to enjoy the magnificent social life of the Austrian court.
Other sources...
http://www.victorianweb.org/history/forpol/vienna.html
http://www.napoleonguide.com/convienna.htm
http://www.napoleonguide.com/convienna.htm
http://www.cusd.chico.k12.ca.us/~bsilva/ib/ibpage.html
There's so much information available from libraries! (Not just in the physical library, but on the library Web sites) To find your local library Web site...
http://lists.webjunction.org/libweb/