Seal of Charles (created before 1134)
The so-called Charlemagne seal is the oldest seal of the city of Aachen and one of the oldest German city seals. It depicts Charlemagne on the throne, the crown on his head, holding the sceptre in his right hand and the orb in his left.
The inscription KAROLVS MAGNVS ROMANORV[M] IMP[ERATOR] AVGVSTVS makes no reference to the city of Aachen, as the seal was originally a court seal and only became the city seal in the 13th century. It was in use until the 18th century.
The seal of Charlemagne served as the model for the medal of the International Charlemagne Prize of the City of Aachen. Replicas of the seal are also awarded by the City of Aachen in recognition of special achievements (such as service anniversaries), as thanks or as gifts.
Marian seal (created around 1327/28)
The so-called Marian seal, also known in the literature as the "Younger Charlemagne Seal", shows Charlemagne kneeling before the enthroned Virgin and Child. He offers her the Palatine Chapel of Aachen in his hands.
Inscription: S[IGILLVM] REGALIS SEDIS AQVENSIS AD CAVSAS (Seal of the Royal See of Aachen for business). It was primarily used to seal documents dealing with spiritual matters, the care of the poor, sick and orphans and the establishment of peace in town and country, and was in use until the end of the 16th century.
Secrecy seal, also: coronation seal (created before 1351)
As a symbol of Aachen as the coronation city of the German kings, the secret seal shows a royal coronation: a king enthroned between two standing bishops. At the king's feet is the oldest known depiction of Aachen's coat of arms.
Inscription: S[IGILLVM] REGALIS SEDIS VRBIS AQVENSIS (Seal of the Royal See of the City of Aachen). The secretarial seal is the most commonly used Aachen city seal, its use is last attested in 1653.