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
After World War II, Germany was occupied and divided. Both new states founded in 1949, the Federal Republic of Germany (West Germany) and the German Democratic Republic (East Germany), took up the "democratic" colours of black, red, and gold again, with the GDR adding their own socialist symbols to their flag in 1959. As a compromise, the Olympic United Team of Germany, which had first competed in 1956, had to add white Olympic rings to the flag for the games of 1960 and 1964, and also for 1968 when two separate German teams entered under common symbols. After the fall of the Berlin Wall in 1989, East German citizens cut out the socialist symbols of the East German flag in order to show support for a unification with West Germany, which had also continued the use of the traditional eagle coat of arms, called "Bundesadler".