During the Napoleonic war, Prussia issued a program that asked citizens to donate their gold jewellery, which led to a movement among the female Prussian nobility to wear black iron jewellery championed by Princess Marianne of Prussia.
fact
During the Napoleonic war, Prussia issued a program that asked citizens to donate their gold jewellery, which led to a movement among the female Prussian nobility to wear black iron jewellery championed by Princess Marianne of Prussia.