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
The German national flag or (), containing only the black-red-gold tricolour, was introduced as part of the (West) German constitution in 1949. Following the creation of separate government and military flags in later years, the plain tricolour is now used as the German civil flag and civil ensign. This flag is also used by non-federal authorities to show their connection to the federal government, e.g. the authorities of the German states use the German national flag together with their own flag.