The transition from independence to a relatively minor part of a larger union was not easily accepted. To quell uprisings Charles V was struggling to exert his power over the citizens of the city, who had struggled to gain a certain level of independence from the bishops and were not willing to cede this to their new lord. The heavily fortified castle Vredenburg was built to house a large garrison whose main task was to maintain control over the city. <answer>The castle would last less than 50 years before it was demolished in an uprising in the early stages of the Dutch Revolt</answer>.
How long did the castle last 
The castle would last less than 50 years before it was demolished in an uprising in the early stages of the Dutch Revolt