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.
Federalist flag
The flag first appeared at the Congress of Europe in 1948, which was organised by the International Committee of the Movements for European Unity; however, the colour of the E was red. The congress demonstrated the first divisions between unionists and federalists (those wanting a loose union and those wanting a United States of Europe). The congress led to the creation of the European Movement and, at its first meeting in Strasbourg in September of the same year, adopted the "E" flag but changed the colour red to green. It intended the flag to be a symbol of hope for peace and unity in Europe. It is unknown who authored the flag, though it is speculated that the man most likely to have proposed it was Duncan Sandys, British Conservative and the son-in-law of Winston Churchill, who was responsible for developing the British European Movement. The flag was first flown in London in 1949 at the European economic congress.