The eagle is used in heraldry as a charge, as a supporter, and as a crest. Heraldic eagles can be found throughout world history like in the Achaemenid Empire or in the present Republic of Indonesia. The European post-classical symbolism of the heraldic eagle is connected with the Roman Empire on one hand, and with Saint John the Evangelist on the other.
Examples of heraldic eagles of the 13th to 16th centuries, from Hugo Gerard Ströhl's Heraldischer Atlas
Carolingian ivory plaque with the Eagle of Saint John with halo, Victoria & Albert Museum.
An early heraldic eagle in the seal of Vienna (1239)
Or two eagles sable armed gules for Homberg (Zürich armorial, c. 1340). At this time, the black-on-gold eagle could still be used for a family of the lower nobility without association to the imperial eagle.
Heraldry is a discipline relating to the design, display and study of armorial bearings, as well as related disciplines, such as vexillology, together with the study of ceremony, rank and pedigree. Armory, the best-known branch of heraldry, concerns the design and transmission of the heraldic achievement. The achievement, or armorial bearings usually includes a coat of arms on a shield, helmet and crest, together with any accompanying devices, such as supporters, badges, heraldic banners and mottoes.
The German Hyghalmen Roll was made in the late 15th century and illustrates the German practice of repeating themes from the arms in the crest. (See Roll of arms).
Reverse of the Narmer Palette, circa 3100 BC. The top row depicts four men carrying standards. Directly above them is a serekh containing the name of the king, Narmer.
Fresco depicting a shield of a type common in Mycenaean Greece.
Vase with Greek soldiers in armor, circa 550 BC.