Heinrich George as Jean Jaurès

Albert Bassermann as Theobald von Bethmann Hollweg

Eugen Klöpfer as Franz Joseph I.

Oskar Homolka as Sergei Dmitrijewitsch Sasonow

Lucie Höflich as Alexandra

Hans Peppler as Count Pourtales

Alfred Abel as Leopold Graf Berchtold

Theodor Loos as Paléologue

Fritz Alberti as Buchanan

Heinrich Schroth as Erich von Falkenhayn

Reinhold Schünzel as Nikolaus II.

Fritz Odemar as Lichnowsky

Viktor de Kowa as Michael

Paul Bildt as Arthur Nicolson

Hermann Wlach as Gottlieb von Jagow

Wolfgang von Schwindt as Moltke

Karl Staudt as Ladislaus of Szögyény-Marich

Bernhard Goetzke as Peter I of Serbia

Olaf Fjord as Alexander of Serbia

Alfred Gerasch as Franz Conrad von Hötzendorf

Ferdinand Hart as General Nikolai Nikolajewitsch

Alexander Granach as Jaurès' Friend

Bruno Ziener as Freiherr von Schoen

Ernst Dernburg as German General

Carl Goetz as Jules Cambon

Ferdinand von Alten as Viviana