During this period, the ultimate catastrophe for Prosper-Louis was the loss of his duchy. By decrees issued in December 1810 and January 1811, Napoleon annexed to France the whole of the Baltic coast from the Ems to the Elbe together with the interior territories without prior announcements to either the towns or the ruling princes concerned. With the exception of Recklinghausen, all the Arenberg lands were affected by this measure. In exchange, the duke of Arenberg became a count of Napoleon's empire and received a pension from the French state. But in January 1811, Recklinghausen was incorporated into the French Grand Duchy of Berg, without a word of warning to the duke's ambassador, baron Schmaus van Livonegg. In addition to his territorial expansion, Napoleon wanted to reinforce the blockade known as the Continental System. This economic and trade embargo against England, which caused so much damage to trade throughout Europe, was in fact broken from the ducal port of Papenburg by hundreds of boats flying the Arenberg flag.
When duke Prosper-Louis returned in May 1814 from captivity in England, the situation had changed once again. At the "battle of the nations" at Leipzig in 1813, the 'Grande Armée', weakened by the Russian campaign, was beaten. Thereupon the Prussian troops had occupied the former Arenberg territories of Meppen, Dülmen and Recklinghausen. When king Louis XVIII gave his instructions to Talleyrand, his ambassador at the Congress of Vienna, he rightly pointed out that the allies did not clearly recognise the rights of the duke of Arenberg nor those of the princes of Salm and Isenburg, and that these princes were being deprived of their sovereignty without their consent.
The treaty of 29 May 1815 between Prussia and the kingdom of Hanover gave the territory of Meppen to Hanover and the remainder, that is Recklinghausen and Dülmen, to Prussia.
In this manner the duke of Arenberg lost a duchy the size of the actual Grand Duchy of Luxembourg.
Size and population of the new duchy of Arenberg
(according to figures given by the Congres of Vienna 1815)
- Vest Recklinghausen: 618.75 km² or 11 square miles for 18,000 inhabitants
(1 German square mile = 56.25 km²)
- Duchy Arenberg-Meppen: 2,250 km² or 40 square miles for 31,000 inhabitants
- Lordship of Dülmen: 309.37 km² or 5.5 square miles for 10,000 inhabitants
In total: 59,000 inhabitants, 3,178 km² or 56.5 square miles
Comparison :
- Size of the Grand-Duchy of Luxemburg today: 2.586 km²
-
Population (2007) :
- Recklinghausen: 125.000 inhabitants
- Kreis Emsland (Meppen): 315.000 inhabitants
- Dülmen: 47.500 inhabitants
- Recklinghausen: 125.000 inhabitants

The new duchy of Arenberg in 1803

The duchy of Meppen

The principality of Recklinghausen

The new duchy of Arenberg in 1806

The new duchy of Arenberg in 1806, including the territory of Dülmen

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