Montesquieu
 

XVIII.12 On the right of nations {among peoples who do not cultivate the land

Since these peo­ples do not live in a limi­ted, cir­cum­scri­bed ter­rain, they will have many occa­sions for of quar­rels among them­sel­ves ; they will fight over fal­low land just as our citi­zens fight over inhe­ri­tan­ces. Thus they will find fre­quent oppor­tu­ni­ties to fight over their hun­ting grounds, their fishing grounds, for fod­der for their live­stock, or to steal away sla­ves ; and having no ter­ri­tory, they will have as many things to set­tle by the law of nations as they have few to decide by civil law.