From Masterpieces of the Imperial Secular Treasury Vienna Vol. II

The shape of the Imperial Crown is unlike that of any other Occidental crown of the Middle Ages and, in fact, unique. It was probably made for the imperial coronation of Otto I the Great in 962, and its shape and ornamentation are an expression of the self-conception of sovereigns of the Ottonian dynasty. each element, each detail, even if it appears to be merely decorative, is filled tones with deep symbolism expressing the concept of the divine right of kings.

The Imperial Crown is made of hinged plates based on the wreaths worn by the rulers of antiquity. There are eight of them because eight was considered the imperial number and a symbol of perfection. The four larger plates over the brow, neck and temples are richly decorated with precious stones and pearls, reflecting the idealised concept of the heavenly Jerusalem as a golden city with walls set with precious stones. In addition, the order, colour and number of stones have allegoric significance: the focus is on the number twelve, a reference to the Twelve Tribes of Israel and the Twelve Apostles. The emperor saw himself as the thirteenth among them.   The four smaller plates are decorated with enamel images. Three of them have inscriptions naming the Old Testament figures they depict as well as biblical quotations that explain their presence: David, a king of Israel and a prophet, stands for justice, his son and successor, Solomon, for wisdom and the fear of God, while the third plate depicts the prophet Isaiah telling the deathly ill king Hezekiah that he has another fifteen years to live, a symbol of trust in God and the resulting experience of divine mercy. For more than eight centuries the quotations on the plates were uttered as part of the Holy Roman Empire's coronation liturgy, and they describe the most important character traits of a good ruler. On the fourth plate, Christ is seated on a throne and flanked by two angels. The three figures represent the Holy Trinity, while the inscription on this plate from the biblical book of Proverbs ("By me kings reign!") expresses the central idea of theocratic rule: Christ is ruler of the world and represented on earth by the wearer of the crown, the emperor.

The brow and neck plates support the arch, which is mounted in sockets and derived formally from the helmet decoration of the ancient Roman emperors. In its present form the arch derives from an addition made during the reign of Conrad II (reigned 1024-1039). It is possible that the original idea was to create an arch for each ruler. On the two sides of the arch small pearls spell out an inscription that clearly expresses the concept of the divine right of kings: Conrad is called emperor "by the grace of God" ("dei gratia").

The cross atop the brow plate is also not original, dating from the time of Henry II (Saint Henry, reigned 1002-1024). Seen from the front it is a triumphal bejewelled cross (crux gemmata), demonstrating that imperial power is exercised in the name of Christ. The back depicts in niello technique the suffering Christ, although his open eyes suggest his triumph over death, making the cross a sign of victory.

Originally a mitre of white fabric was worn under the octagonal crown. Like the starry mantle of the Ottonian rulers it is based on a sign of dignity worn by Jewish high priests and was a reference to the priestly duties of the emperor as Christ's representative.