The Margraviate of Brandenburg developed from the medieval Northern March of the Holy Roman Empire, passing to the House of Hohenzollern in 1415.
The Duchy of Prussia originated in 1525 when Albert of Brandenburg-Ansbach, a member of a cadet branch of the Hohenzollern house, secularized the eastern lands of the Teutonic Knights as a Polish fief.
The Prussian war flag (3:5), adopted November 28, 1816, was originally swallow-tailed for one-fifth of the total length; the tail was later abandoned.
The royal standard of Prussia showed the Iron Cross charged with the shield and crown of the small state arms surrounded by the collar of the Order of the Black Eagle.
[2] The Germany national football team home dress has always been a white jersey and black shorts, the colors of the Prussian flag.