Hildesheim Cathedral in the context of "Duchy of Saxony"

Sacred mysteries are the areas of supernatural phenomena associated with a divinity or a religious belief and praxis. Sacred mysteries may be either:

1. Religious beliefs, rituals or practices which are kept secret from the uninitiated.
2. Beliefs of the religion which are public knowledge but cannot be easily explained by normal rational or scientific means.

A mystagogue or hierophant is a holder and teacher of secret knowledge in the former sense above, while mysticism may be defined as an area of philosophical or religious thought focusing on mysteries in the latter sense.

The Wrisberg Epitaph is a triptych, which was created by the Hildesheim painter Johannes Hopffe († 1615) in 1585 as an epitaph for the Domherr Ernst von Wrisberg. The original frame did not survive. However, copies were created and subsequently hidden during the Second World War, the central one could be viewed in the south transept of Hildesheim Cathedral until January 2010. During the renovation of the cathedral (2010–2014) the three panels were on display in a reconstructed frame in the Weserrenaissance-Museum in Schloss Brake, Lemgo.

Henry II (German: Heinrich II; Italian: Enrico II; Latin: Henricus; 6 May 973 – 13 July 1024), also known as Saint Henry, Obl. S. B., was Holy Roman Emperor (Latin: Romanorum Imperator) from 1014. He died without an heir in 1024, and was the last ruler of the Ottonian line. As Duke of Bavaria, appointed in 995, Henry became King of the Romans (Latin: Rex Romanorum) following the sudden death of his second cousin, Emperor Otto III in 1002, was made King of Italy (Latin: Rex Italiae) in 1004, and crowned emperor by Pope Benedict VIII in 1014.

The son of Henry II, Duke of Bavaria, and his wife Gisela of Burgundy, Emperor Henry II was a great-grandson of German king Henry the Fowler and a member of the Bavarian branch of the Ottonian dynasty. Since his father had rebelled against two previous emperors, the younger Henry spent long periods of time in exile, where he turned to Christianity at an early age, first finding refuge with the Bishop of Freising and later during his education at the cathedral school in Hildesheim. He succeeded his father as Duke of Bavaria in 995 as Henry IV. As duke, he attempted to join his second-cousin, Emperor Otto III, in suppressing a revolt against imperial rule in Italy in 1002. Before Henry II could arrive, however, Otto III died of fever, leaving no heir. After defeating several contenders to the throne, Henry II was crowned King of Germany on 9 July 1002 as the first in a line of kings to adopt the title Rex Romanorum as an antedate to his coronation in Rome as Imperator Romanorum. On 15 May 1004, he was anointed King of Italy (Rex Italiae). In that same year, Henry II joined Duke Jaromír of Bohemia in his struggle against the Poles, thus effectively incorporating the Duchy of Bohemia into the Holy Roman Empire.

The Bernward Doors (German: Bernwardstür) are the two leaves of a pair of Ottonian or Romanesque bronze doors, made c. 1015 for Hildesheim Cathedral in Germany. They were commissioned by Bishop Bernward of Hildesheim (938–1022). The doors show relief images from the Bible, scenes from the Book of Genesis on the left door and from the life of Jesus on the right door. They are considered a masterpiece of Ottonian art, and feature the oldest known monumental image cycle in German sculpture, and also the oldest cycle of images cast in metal in Germany.

The Bernward Column (German: Bernwardssäule) also known as the Christ Column (German: Christussäule) is a bronze column, made c. 1020 for St. Michael's Church in Hildesheim, Germany, and regarded as a masterpiece of Ottonian art. It was commissioned by Bernward, the thirteenth bishop of Hildesheim in 1020, and made at the same time. It depicts images from the life of Jesus, arranged in a helix similar to Trajan's Column: it was originally topped with a cross or crucifix. During the 19th century, it was moved to a courtyard and later to Hildesheim Cathedral. During the restoration of the cathedral from 2010 to 2014, it was moved back to its original location in St. Michael's, but was returned to the Cathedral in August 2014.

A wheel chandelier is a lighting installment, in the form of a chandelier hanging from the ceiling in the form of a spoked wheel. The oldest and most important examples derive from the Romanesque period.

Wheel chandeliers were made for the practical purpose of lighting the great churches and other public areas, but in religion they also had symbolic significance, depicting the Garden of Eden or the Kingdom of God. The wheel, its gates, and its towers, which are usually decorated with Prophets and Apostles or inscribed with their names, symbolise the city walls of the New Jerusalem. The buttresses, towers, and candles number twelve or a multiple of twelve, after the numerology of the Book of Revelation. This symbolism is first found on two wheel chandeliers of Hildesheim Cathedral. The great wheel chandelier of the Church of the Holy Sepulchre was an inspiration.

The Hezilo chandelier (German: Heziloleuchter) is an 11th-century Romanesque wheel chandelier. It is part of the treasures of the Hildesheim Cathedral in Hildesheim, Germany, which has been a UNESCO World Cultural Heritage site since 1985. The chandelier was most likely commissioned by Bishop Hezilo of Hildesheim, who rebuilt the cathedral after a fire. He probably also influenced the program of imagery and inscriptions. It is the largest of four extant wheel chandeliers of the period; the others surviving examples are the Azelin chandelier (also in Hildesheim), the Barbarossa chandelier in the Aachen Cathedral, and the Hartwig chandelier in the Abbey of Comburg.

During the restoration of the cathedral (from 2010 to 2014), the chandelier was installed in St. Godehard, a basilica since 1963 and the temporary bishop's seat. After the restoration of the cathedral, which reopened on 15 August 2014, it was returned to its original location in the cathedral's nave.

The Azelin chandelier 1018 A.D (German: Azelinleuchter) is a Romanesque wheel chandelier, made in the 11th century for the Hildesheim Cathedral in Hildesheim, Germany, a UNESCO World Cultural Heritage site since 1985. It is the oldest of four extant wheel chandeliers from that period, along with the Hezilo chandelier, also in Hildesheim, the Barbarossa chandelier in the Aachen Cathedral, and the Hartwig chandelier in the Abbey of Comburg. It was believed to be donated by Bishop Azelin, however his predecessor Thietmar is more likely to be the patron. Therefore, the chandelier is also called the Thietmar chandelier (Thietmarleuchter).