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 Navy
The German Navy traces its roots back to the "Reichsflotte" (Imperial Fleet) of the revolutionary era of 1848–52. The Reichsflotte was the first German navy to sail under the black-red-gold flag. Founded on 14 June 1848 by the orders of the democratically elected Frankfurt Parliament, the Reichsflotte's brief existence ended with the failure of the revolution and it was disbanded on 2 April 1852; thus, the modern day navy celebrates its birthday on 14 June.