From 13 June to 13 July, 1878, were held the sessions of the Berlin Congress; since this date Berlin has developed into a great metropolis ; it has become the most important industrial city of the European continent, the most important railway centre, and one of the chief commercial cities of the empire.
In 1871 Berlin became the capital of the new German Empire.
1571) was the last Catholic priest in Berlin until the coming of the Dominicans about one hundred and fifty years later.
The city suffered greatly during the Thirty Years War, its population sinking to 4,000 in consequence of a plague.
Kolln is mentioned for the first time in an official document dated 1237; Berlin, in 1244.
Even at this date both places possessed the rights of Brandenburgian cities, but were not equal in importance to other cities of the Mark.