The history of the cathedral bells at a glance:
1035: Bishop Godehard has a belfry built in the west of the cathedral and equips it with bells
1046: The first ‘Cantabona’ (approx. 100 hundredweights) is cast
12th century: Further bells (presumably also in the crossing tower) are added
1350: A new Marienglocke bell weighing approx. 180 hundredweights is cast by Johannes von Halberstadt
1590: The Cantabona shatters on New Year's Day
1601: New casting of the Cantabona (80 hundredweights) by Joachim Schrader from Hanover
1688: The Marienglocke from 1350 shatters on 5 July
18th century: After the construction of the new crossing tower, several bells are recast or moved
1760/1763: Two bells (Apostle and St Mary's bells) from 1733 and 1744 respectively crack
1765/66: New casting of five bells by Johann Martin Roth from Mainz
1796: Casting of a further three smaller bells by Christoph August Becker (II) from Hildesheim
1872: The Cantabona from 1601 shatters
1875: New casting of the Cantabona weighing approx. 8 tonnes by Hermann Große from Dresden
1942: 8 (or 9) bells are sold for armaments purposes (including the Cantabona)
1945: The remaining bells (presumably except for one in the crossing tower) are severely damaged or destroyed in the air raid on 22 March. After the war, six bells (some also badly damaged) return from the Hamburg ‘bell cemetery’.
1960: New casting of five bells by Friedrich Wilhelm Schilling from Heidelberg. The apostle bell from 1765 is retuned from a0 to as0 and incorporated into the new ringing system. The complete plan for twelve bells is not realised for financial reasons.
2010: Decommissioning of the 1960 bells for the duration of the cathedral renovation until 2014
2013: New casting of six more bells by Albert Bachert from Karlsruhe to complete the existing ringing system
2014: Consecration of the new cathedral bells on 14 May. First ringing of all twelve cathedral bells on 15 August