The Congress of Vienna (1814–15) was the largest diplomatic gathering in European history to that date. Attendance was tiered:
| Power | Principal Representative | Key Goal |
|---|---|---|
| Austria (host) | Prince Klemens von Metternich (Chancellor) | Conservative order, German/Italian influence, balance |
| United Kingdom | Viscount Castlereagh (Foreign Sec.) → Duke of Wellington | Maritime security, balance, no territorial gains |
| Russia | Tsar Alexander I (personally) + Count Nesselrode | Poland, "Holy Alliance", Ottoman containment |
| Prussia | Prince Karl August von Hardenberg (Chancellor) + Wilhelm von Humboldt | Rhineland, Saxony, German leadership |
| France | Charles-Maurice de Talleyrand-Périgord | Restore France to great-power status, legitimacy |
Envoys from virtually every German state (Bavaria, Württemberg, Baden, Hesse, etc.), free cities (Hamburg, Bremen, Lübeck, Frankfurt), and minor principalities — mostly observers, some lobbying for territory/status.
The Congress became a social spectacle — balls, concerts, hunting parties — where informal diplomacy often decided more than formal sessions. "The Congress dances" (Le congrès danse) — but the work was deadly serious.