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.
Flag of Germany
After the defeat of Germany in World War II, the country was placed under Allied administration. Although there was neither a national German government nor a German flag, German ships were required by international law to have a national ensign of some kind. As a provisional civil ensign of Germany, the Council designated the international signal pennant Charlie representing the letter C ending in a swallowtail, known as the C-Pennant (). The Council ruled that "no ceremony shall be accorded this flag which shall not be dipped in salute to warships or merchant ships of any nationality". Similarly, the Japanese civil ensign used immediately following World War II was the signal pennant for the letter E ending in a swallowtail, and the Ryūkyūan civil ensign was a swallowtailed letter D signal pennant.