September 2020 marks 70 years since the signing of the twinning agreement between Portsmouth and Duisburg in Germany.
The partnership was announced in 1950 and is the second oldest Anglo-German twinning, which aimed to unite Germany with Europe after the war.
More than 70,000 people have been involved with the partnership so far. The cities have exchanged music, art and sport, and many groups have visited the cities over the years.
Discover more about the history of the twinning in this short video voiced by the Lord Mayor of Portsmouth, Cllr Rob Wood.