Flag of Germany
When Heinrich XI, Prince Reuss of Greiz was appointed by Joseph II, Holy Roman Emperor to rule the then-new Principality of Reuss-Greiz on 12 May 1778, the flag adopted by the "Fürstentum Reuß-Greiz" was the first-ever appearance of the black-red-gold tricolour in its modern arrangement in any sovereign state within what today comprises Germany – the Reuss elder line that ruled the principality used a flag whose proportions were close to a "nearly square"-shape 4:5 hoist/fly ratio, instead of the modern German flag's 3:5 figure.
National colours of Germany
When on 18 May 1848 the Frankfurt Parliament first convened, the city streets were decorated in the "German colours" like the assembly room in St. Paul's Church. On November 12, the parliament passed a resolution whereafter black-red-gold became the German war and merchant flag. However, as official flag of the German Confederation, the tricolour was mainly used in the small Imperial fleet (Reichsflotte), which was dissolved by 1852. The Frankfurt Constitution, adopted in 1849 and never carried into effect, omitted any provision of national symbols. After the dissolution of the Frankfurt Parliament, the tricolour vanished from public space. Mocked by Heinrich Heine as "old Germanic rubbish", it nevertheless remained the official flag of the German Confederation, "revitalized" in 1866 as the banner of Austria and her allies in the War with Prussia and the North German states.