Wikipedia, Link-https://en.wikipedia.org/wiki/Coats_of_arms_of_the_Holy_Roman_Empire Coats of arms of prince electors surrounding the double-headed Reichsadler (1545).Over its long history, the Holy Roman Empire used many different heraldic forms, representing its numerous internal divisions.
Imperial coat of arms
Greater Coat of arms of emperor Joseph II, c. 1765–1790
Imperial Habsburg coat of arms, for Rudolf II, from Siebmachers Wappenbuch (1605). The surrounding coats of arms represent Habsburg possessions, the inescutcheon exceptionally combines the Austrian and Castilian arms, for Habsburg Austria and Habsburg Spain.Coats of arms of Holy Roman EmperorsFurther information: ReichsadlerThe Reichsadler ("Imperial Eagle") was the heraldic eagle, derived from the Roman eagle standard, used by the Holy Roman Emperors and in modern coats of arms of Germany, including those of the Second German Empire (1871–1918), the Weimar Republic (1919–1933) and the "Third Reich" (Nazi Germany, 1933–1945). The same design has remained in use by the Federal Republic of Germany since 1945, but under a different name, now called Bundesadler ("Union Eagle" or "Federal Eagle", from German "Bund", genitive form "Bundes" meaning 'Union' or 'Federation', and "Adler" meaning 'Eagle').