Question: What is the population of the city that was once the national capital of the Confederation of the Rhine from 1806 to 1815 ?

text: List of former national capitals
Europe -- Western Europe

Throughout the world there are many cities that were once national capitals but no longer have that status because the country ceased to exist, the capital was moved, or the capital city was renamed. This is a list of such cities, sorted by country and then by date. Where a city name has changed, the name of the city when it was a capital is listed first, followed by its modern name in brackets.
Old capital city Country Today a part of From Until Change , reason
Vienna Austrian Empire Austria 1806 1867 became capital of the Austro-Hungarian Empire
Vienna Austro-Hungarian Empire Austria 1867 1918 became capital of the Republic of Austria after Empire collapsed
Tournai Francia Belgium 431 486 Under kings Childeric I and Clovis I , Tournai was the capital of the Frankish empire . In the year 486 , Clovis moved the centre of power to Paris , as a result , the Low Countries region ceased to be the political centre of the Frankish empire
Kelmis Neutral Moresnet Belgium 1816 1919 Moresnet annexed by Belgium
Vichy France , State of France 1940 1944 capital of Vichy France régime , defeated by Allies
Aachen Carolingian Empire Germany 800 814 became capital of Charlemagne as Imperator Augustus and Emperor of the Carolingian Empire
Karlsruhe Baden , Grand Duchy of Germany 1771 1918 Baden became part of the German Empire in 1871 , and lost sovereignty fully in 1918 . Karlsruhe remained the capital of the German state of Baden until 1945
Munich Bavaria , Kingdom of Germany 14th century 1918 Bavaria became part of the German Empire in 1871 , and lost sovereignty fully in 1918 . Munich remains the capital of the German state of Bavaria
Braunschweig ( Brunswick ) Brunswick , Duchy of Germany 1815 1918 Brunswick became part of the German Empire in 1871 , and lost sovereignty fully in 1918 . Braunschweig remained the capital of the German Free State of Brunswick until 1946 when it became part of the German state of Lower Saxony
Frankfurt Rhine , Confederation of the Germany 1806 1815 Confederation dissolved
Frankfurt German Confederation Germany 1815 1866 German Confederation dissolved
Berlin German Empire Germany 1871 1918
Berlin Germany ( Weimar Republic ) Germany 1919 1933
Berlin Germany ( Nazi Germany ) Germany 1933 1945 Separation of Germany into occupation zones for the Allied powers
Bonn Germany , West Germany 1949 1990 Moved to Berlin after re-unification of Germany . Bonn retained as the German seat of government until 1999
East Berlin Germany , East Germany 1949 1990 East Berlin and West Berlin merged to form reunified Berlin , country ceased to exist after reunification of Germany
Hanover Hanover , Kingdom of Germany 1814 1866 Hanover annexed by Prussia , became capital of the Prussian Province of Hanover , currently the capital of the German state of Lower Saxony
Darmstadt Hesse-Darmstadt , Landgraviate of , Hesse , Grand Duchy of Germany 1567 1918 Hesse-Darmstadt became part of the German Empire in 1871 , and lost sovereignty fully in 1918 . Darmstadt remained the capital of the German People 's State of Hesse until 1945
Kassel Hesse-Darmstadt , Landgraviate of , Hesse-Kassel , Landgraviate of , Hesse , Electorate of Germany 1277 1866 Hesse-Kassel annexed by Prussia in 1866 ; Kassel became capital of the Prussian province of Hesse-Nassau
Wiesbaden Nassau , Duchy of Germany 1816 1866 Nassau annexed by Prussia , currently the capital of the German state of Hesse