Difference between Bonn and Bonn

What is the difference between Bonn and Bonn?

Bonn as a proper noun is a city in the state of north rhine-westphalia, germany, which was the former capital of west germany while Bonn as a proper noun is a city in the state of north rhine-westphalia, germany, which was the former capital of west germany

We hope you now know whether to use Bonn or Bonn in your sentence.