For centuries mankind has longed for peace and for peaceful solutions to conflicts, but only in the last centuries peace has been perceived as an achievable political aim: in this way the idea of war abolition has become thinkable, associations devoted to peace (and pacifism as a sort of peace party) arose, and international organizations with the goal of banning war and promoting peace-keeping operations developed. The course gives an historical introduction to the peace issue as one of the nodal points in contemporary politics up to the beginning of the 21st Century. It is devoted to the international history of peace ideas, peace movements, and peace institutions.