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
The national colours of the Federal Republic of Germany are officially black, red, and gold, defined with the adoption of the West German flag as a tricolour with these colours in 1949. As Germany was divided into West Germany and East Germany beginning in 1949 and continuing through 1990, both Germanies retained the black, red, and gold colors on each respective flag. After German reunification in 1990, West and East Germany adopted the West German flag as the flag of the reunited Germany, therefore maintaining black, red, and gold as Germany's colors.