Kant's reputation as a philosopher of peace is sufficiently well established, and his plan to achieve peace through comprehensive legislation is well known. Little is known, however, that Kant also had concrete ideas about the regulation of war that should actually bring about a state of peace. The present study is not an examination of all facets of Kant's thoughts on war; Ultimately, there aren't many questions left unanswered for Kant about the war. What it should be about is more comprehensive: With the question of legitimate violence in the states of nature, the subject area to be dealt with extends beyond the sphere of the interstate, because the topic is also permitted interpersonal violence in the I. state of nature as it is e.g. B. can still take place in civil wars today. The solution to the problem requires a journey across Kant's work: from the philosophy of law to ethics, through aesthetics to the philosophy of history.