Congress of Aix-la-Chapelle (1818)

Congress memorial in Aachen

The Congress of Aix-la-Chapelle, held in the autumn of 1818, was primarily a meeting of the four allied powers Britain, Austria, Prussia and Russia to decide the question of the withdrawal of the army of occupation from France and the nature of the modifications to be introduced in consequence into the relations of the four powers towards each other, and collectively towards France.[1]

It was part of the series of conferences in the Concert of Europe.

France succeeded in its goal of reducing the obligations imposed by the Treaty of Paris of 1815, which involved stationing an Allied army in France and reparations. The occupation was formally terminated at the conference on 30 September 1818; by 30 November evacuation was complete. The French representative Duc de Richelieu succeeded in having France admitted as a full discussion partner in the European congress system and France's position as a European power was restored.


The congress, convened in Aachen (Aix-la-Chapelle) on 1 of October, and its first session was attended by emperor Alexander I of Russia, the emperor Francis I of Austria, and Frederick William III of Prussia. Britain was represented by Lord Castlereagh and the duke of Wellington, Austria by Prince Metternich, Russia by Counts Capo d'Istria and Nesselrode, Prussia by Prince Hardenberg and Count Bernstorff. The Duc de Richelieu, by favour of the Allies, was present on behalf of France.[1] Members of the Rothschild banking dynasty were also heavily involved in the congress.

A treaty for withdrawal

The evacuation of France by Allied units was agreed to in principle at the first session, the consequent treaty being signed on 9 October. The immediate object of the conference being thus readily disposed of, the time of the congress was mainly occupied in discussing the form to be taken by the European alliance, and the "military measures",[1] if any, to be adopted as a precaution against a fresh outburst on the part of France. The proposal of the emperor Alexander I to establish a "universal union of guarantee" on the broad basis of the Holy Alliance,[1] after much debate, broke down on the uncompromising opposition of Britain; and the main outcome of the congress was the signature, on 15 November, of two instruments:[1]

  1. a secret protocol confirming and renewing the Quadruple Alliance established by the treaties of Chaumont and Paris (of 20 November 1815) against France
  2. a public "declaration" of the intention of the powers to maintain their intimate union, "strengthened by the ties of Christian brotherhood",[1] of which the object was the preservation of peace on the basis of respect for treaties.

The secret protocol was communicated in confidence to Richelieu; to the declaration France was invited publicly to adhere.[1]

Diverse resolutions

Besides these questions of general policy, the congress concerned itself with a number of subjects left unsettled in the hurried winding up of the Congress of Vienna, or which had arisen since. The most important were the methods to be adopted for the suppression of the international slave-trade and the Barbary pirates. In neither case was any decision arrived at, owing mainly to the refusal of the other powers to agree with the British proposal for a reciprocal right of search on the high seas and to the objection of Britain to international action which would have involved the presence of a Russian squadron in the Mediterranean.[2]

In matters of less importance the congress was more unanimous. Thus on the urgent appeal of the king of Denmark, Charles XIV of Sweden received a peremptory summons to carry out the terms of the Treaty of Kiel; [2] The petition of the Prince-elector of Hesse to be recognized as king was unanimously rejected; and measures were taken to redress the grievances of the German mediatized princes.[2]

The important outstanding questions in Germany, e.g. the Baden succession, were after consideration reserved for a further conference to be called at Frankfurt/Main.[2]

European governance

In addition to these a great variety of questions were considered, from the treatment of Napoleon at Saint Helena to the grievances of the people of Monaco against their prince and the position of the Jews in Austria and Prussia. An attempt made to introduce the subject of the Spanish colonies was defeated by the opposition of Britain.[2]


Certain vexatious questions of diplomatic etiquette were settled once and for all.[2] (see diplomatic rank and Aix-la-Chapelle: Diplomatic Precedence of Ministers Resident)


The congress, which broke up at the end of November, is of historical importance mainly as marking the highest point reached during the 19th century in the attempt to govern Europe by an international committee of the powers. The detailed study of its proceedings is highly instructive in revealing the almost insurmountable obstacles to any really effective international system diplomat prior to the creation of the League of Nations after the First World War.[3]

Gallery of delegates



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