London Protocol (1852)
On 8 May 1852, after the First War of Schleswig, an agreement called the London Protocol was signed. This international treaty was the revision of an earlier protocol, which had been ratified on 2 August 1850, by the major Germanic powers of Austria and Prussia. The second London Protocol was recognised by the five major European powers—Austria, France, Prussia, Russia, and the United Kingdom—as well as by the Baltic Sea powers of Denmark and Sweden.
The Protocol affirmed the integrity of the Danish federation as a "European necessity and standing principle". Accordingly, the duchies of Schleswig (a Danish fief), and Holstein and Lauenburg (German fiefs) were joined by personal union with the Kingdom of Denmark. However, Frederick VII of Denmark was childless, so a change in dynasty was imminent and the lines of succession for the duchies and Denmark diverged. That meant that, contrary to the Protocol, the new King of Denmark would not also be the new Duke of Holstein and Duke of Lauenburg. So for this purpose, the line of succession to the duchies was modified. Further, it was affirmed that the duchies were to remain as independent entities, and that Schleswig would have no greater constitutional affinity to Denmark than Holstein did.
The major powers primarily wanted to ensure, by guaranteeing Denmark's territorial integrity, that the strategically significant port of Kiel would not fall into Prussian hands. Eleven years later, this treaty became the trigger for the German–Danish war of 1864. Prussia and Austria declared that Denmark had violated the Protocol by introducing the November Constitution, which Christian IX of Denmark signed on 18 November 1863. After an initial period of joint Austro–Prussian administration, Kiel was ultimately delivered to Prussia in 1867.
- Hjelholt, Holger (1971). Great Britain, the Danish–German conflict and the Danish succession 1850–1852: From the London Protocol to the Treaty of London (the 2nd of August 1850 and the 8th of May 1852). Copenhagen, Denmark: Munksgaard. p. 38.
- Holt & Chilton 1917, pp. 75–76.
- Holt, Lucius Hudson; Chilton, Alexander Wheeler (1917). The History of Europe from 1862 to 1914: From the Accession of Bismarck to the Outbreak of the Great War. Macmillan. Accessed online at Google Books.
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