King Christian X of Denmark is photographed here riding through the streets of Copenhagen on his 70th birthday on the 26th of September, 1940.
The image was taken during the Nazi occupation of the country. The King became famous for his daily rides unaccompanied by guards, a sign of defiance against the Germans.
The occupation began in April of 1940, and continued until the defeat of Nazi Germany in 1945 at the end of the Second World War.