Short answers, pulled from the story.
The first documented church on this site appears in records from the year 822. Historical accounts link its establishment to the late 8th century reigns of bishops Wikterp and Simpert.
Empress Adelaide funded this specific restoration project to stabilize the crumbling structure. The western apse had previously crumbled down in 994 but was restored with funding from empress Adelaide.
The cathedral measures 113 meters in length and 40 meters in width. The two towers visible today reached completion in 1075 and stand 62 meters high above the city.
Five stained glass windows in the southern clerestory date to the late 11th or early 12th centuries. These represent the oldest surviving stained glass windows in Germany featuring prophets David, Jonah, Daniel, Moses, and Hosea.
In 1565 workers heightened the northern tower to increase its prominence over the skyline. This change occurred during a period when the church suffered limited damage compared to other German cathedrals.