Rosa Luxemburg (Rosalia Luxemburg, Polish: Róża Luksemburg; 5 March 1871, Zamość, Vistula Land, Russia – 15 January 1919, Berlin, Weimar Republic) was a Polish-Jewish-German Marxist theorist, socialist philosopher, and revolutionary for the Social Democracy of the Kingdom of Poland and Lithuania, the German SPD, the Independent Social Democratic Party and the Communist Party of Germany.
In 1914, after the SPD supported German participation in World War I, she co-founded, with Karl Liebknecht, the revolutionary Spartakusbund (Spartacist League), that on 1 January 1919 became the Communist Party of Germany (KPD). In November 1918, during the German Revolution she founded the Die Rote Fahne (The Red Flag), the central organ of the left wing revolutionaries.
She regarded the Spartacist uprising of January 1919 in Berlin as a mistake, but supported it after it had begun. When the revolt was crushed by the Freikorps (right wing militias defending the Weimar regime and composed of World War I veterans), Luxemburg, Liebknecht and hundreds of their supporters were captured, manhandled and killed. Since their deaths, Luxemburg and Karl Liebknecht have achieved great symbolic status amongst both social democrats and Marxists.