And you can see their names, their ages, and then when they were killed. Historians believe five to six million Jews were killed during the Holocaust, including a million and a half children. This was two thirds of the Jewish population of Europe. But the Holocaust went further. It's believed that over 10 million civilians were killed during the Holocaust. Over three million prisoners of war were killed. And other people, including several hundred thousand Romani often referred to as gypsies, several hundred thousand people with disabilities, many thousands of homosexuals were all put to death during the Holocaust.