The local rulers of Persis in the Seleucid and Parthian eras (3rd-2nd centuries BC) sometimes used an eagle as the finial of their banner.
[citation needed] In early heraldry or proto-heraldry of the 12th century, however, the eagle as a heraldic charge was not necessarily tied to either imperial or biblical symbolism.
The earliest known use of the eagle as a heraldic charge is found in the Great Seal of Leopold IV of Austria, dated 1136.
[citation needed] By far the oldest and most common manner of depicting the eagle in heraldry is what would come to be known as displayed (éployée), in direct imitation of Roman iconography.
Later, English heraldry partially adopted the continental convention, leading to a situation where it was unclear whether the two forms should be considered equivalent.
The claws now form an acute angle relative to the body, occasionally receiving a "hose" covering the upper leg.
In its relatively few instances in Gallo-British heraldry (e.g. the arms of the Earls of Dalhousie) the outermost feathers are typically longer and point upward.
(Trussed - the term when depicting domestic or game birds with their wings closed - is not used because the eagle is a proud animal and the word implies it is tied up or bound by a net.)
Kleestängel, also Kleestengel or Klee-Stengeln ("clover-stems"), are the pair of long-stemmed trefoil-type charges originating in 13th-century German depictions of the heraldic eagle.
Brustspange, also Brustmond or Brustsichel, is an elongated crescent across the breast and wings (in effect, a pair of Kleestängel extended to join each other).
When two eagles are depicted on a field, they are usually shown combatant, that is, facing each other with wings spread and one claw extended, as though they were fighting.
Respectant, the term used for depicting domestic or game animals shown facing each other, is not used because eagles are aggressive predators.
To difference it from a decapitate (headless) eagle, the alerion has a bulb-shaped head with an eye staring towards the dexter (right-hand side) of the field.
The eagle is used as an emblem by the Holy Roman Emperors from at least the time of Otto III (late 10th century), in the form of the "eagle-sceptre".
Matthew Paris' Chronica Majora (c. 1250) displays a coat of arms with a black double-headed eagle in a yellow field for Otto IV.
Outside of these exceptional depictions (in sources from outside of Germany), the double-headed eagle remains unattested as emblem of the German kings or emperors until the 1430s.
Its use as an imperial emblem, however, is considerably younger, attested with certainty only in the 15th century, i.e. at about the same time the double-headed eagle was also adopted in the Holy Roman Empire.
In the 15th century, the double-heade eagle was first used as an emblem by the semi-autonomous Despots of the Morea, who were younger imperial princes, and by the Gattilusi of Lesbos, who were Palaiologan relatives and vassals.
Other Balkan states followed the Byzantine model as well: chiefly the Serbians, but also the Bulgarians and Albania under George Kastrioti (better known as Skanderbeg), while after 1472 the eagle was adopted by Muscovy, when Ivan III of Russia married Sophia, daughter of Thomas Palaiologos.
John the Evangelist, the author of the fourth gospel account, is symbolized by an eagle, king of the birds, often with a halo.
[21] The best-known heraldic use of the Eagle of St. John has been the single supporter chosen by Queen Isabella of Castile in her armorial achievement used as heiress and later integrated into the heraldry of the Catholic Monarchs.
[23] The Eagle of the Evangelist was restored as single supporter holding the 1939, 1945 and 1977 official models of the armorial achievement of Spain,[24] but been removed in 1981 when the current design was adopted.
[27] The Moravian Eagle (without chequering) was first documented on the seal of Ottokar's uncle, Margrave Přemysl (d. 1239) and is thus likely derived from the coat of arms of the Přemyslid dynasty, who in the early 13th century used a "flaming eagle" coat of arms alongside the Bohemian lion for the Kingdom of Bohemia.
Benjamin Franklin is quoted in a letter to his daughter regretting the eagle's use as a national symbol, calling it a "bird of bad moral character" that steals from other birds and is easily frightened, and joking that it is good that the eagle in the Cincinnati's proposed seal looked more like a turkey.
This was the bronze sculpture of an eagle weighing 1.85 kg (4 lb), mounted on top of the blue regimental flagpole.
Upon Napoleon's fall, the restored monarchy of Louis XVIII of France ordered all eagles to be destroyed and only a very small number escaped.
When the former emperor returned to power in 1815 (known as the Hundred Days) he immediately had more eagles produced, although the quality did not match the originals.
The workmanship was of a lesser quality and the main distinguishing changes had the new models with closed beaks and they were set in a more crouched posture.
As a heraldic symbol identified with Arab nationalism, the Eagle of Saladin was subsequently adopted as the coats of arms of Iraq and Palestine.
[32][33] The bird's design is derived from a number of soapstone sculptures found in the ruins of the ancient city of Great Zimbabwe.