Crown Princess Mette- Marit and Crown Prince Haakon of Norway attend the Nobel Peace Prize ceremony 2018 at Oslo City Town Hall on December 10, 2018 in Oslo, Norway. The Congolese gynecologist, Denis Mukwege, who has treated thousands of rape victims, and Nadia Murad, the Iraqi Yazidi, who was sold into sex slavery by Isis, have been jointly awarded the 2018 Nobel peace prize in recognition for for their efforts to end the use of sexual violence as a weapon in war.