After excavations in the Cathedral Square (Domplatz) in the postwar period, the Hammaburg was considered fully discovered. A reassessment in 2002 of the discoveries suggested that the fortification is much younger and dates from the 10th century. A new turn came with the evaluation of the last major excavation in 2005/06: There were two previous versions of the rampart, one from Saxon times in the 8th century and another from the 9th century, which must be the historic Hammaburg.