The Throne of Charlemagne (Karlsthron or Aachener Königsthron, "Royal Throne of Aachen") is a throne erected in the 790s by Charlemagne, as one of the fittings of his palatine chapel in Aachen (today's Aachen Cathedral) and placed in the Octagon of the church. Until 1531, it served as the coronation throne of the King of the Romans, being used at a total of thirty-one coronations. As a result, especially in the eleventh century, it was referred to as the totius regni archisolium ("Archstool of the Whole Realm"). Charlemagne himself was not crowned on this throne, but instead in the Old St. Peter's Basilica in Rome by Pope Leo III in 800 AD.
The throne is very plain and simple and entirely free of ornamentation. Six steps lead up to the seat, which is on a podium. The seat itself consists of four marble plates held together with bronze clamps. According to one modern theory, the marble and the steps were taken from the Church of the Holy Sepulchre in Jerusalem around 800. Another (unverified) interpretation claims they are the steps of Pilate's palace, which Jesus climbed up after he was whipped. There are fine, incised lines on one of the two side-plates, which served as the board for an ancient game of nine men's morris. The back plate shows an early depiction of the crucifixion. Based on the surface treatment and the presence of etchings from several eras of pagan and Christian themes, it can be concluded that when the plates were installed here, they had belonged to at least two contexts already.
The wooden interior structure, which is now in the Rheinisches Landesmuseum Bonn, supported a now-lost marble seating plate. Under that is a shelf, on which part of the Imperial Regalia were kept, particularly St. Stephen's Purse, according to modern research. Radiocarbon dating shows that this oakwood panel dates to c.800.
The throne rests on four stone pillars. This made it possible for visitors in later times to crawl under the throne, simultaneously a demonstration of humility to the newly anointed ruler and an act of veneration for Jesus Christ, who was related to the throne by the depiction on the rear marble plaque (see under Symbolism).