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.
German New Guinea
In 1914 a series of drafts were made for proposed Coat of Arms and Flags for the German Colonies. However, World War I broke out before the designs were finished and implemented and the symbols were never actually taken into use. Following the defeat in the war, Germany lost all its colonies and the prepared coat of arms and flags were therefore never used.