According to conventional wisdom, self-governance cannot facilitate order between the members of different social groups. This is considered particularly true for the members of social groups who are avowed enemies of one another. This paper argues that self-governance can do this. To investigate my hypothesis, I examine the Anglo-Scottish borderlands in the sixteenth century. The border people belonged to two social groups at constant war with one another. These people pillaged and plundered

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... e another as a way of life they called "reiving." To regulate this system of intergroup banditry and prevent it from degenerating into chaos, border inhabitants developed a decentralized system of cross-border criminal law called the Leges Marchiarum. These laws of lawlessness governed all aspects of cross-border interaction and spawned novel institutions of their enforcement. The Leges Marchiarum and its institutions of enforcement created a decentralized legal order that governed intergroup relations between hostiles along the border. Insecurity paralyzes only when it is such in nature and in degree that no energy of which mankind in general are capable affords any tolerable means of self-protection. (John Stuart Mill [1848, p. 882])