Romarna byggde murar för att hålla barbarerna ute | National Geographic

 Romarrikets medborgare­ kunde röra sig fritt och utnyttja den blomstrande, penningbaserade handeln på städernas torg, medan det krävdes särskilt tillstånd (och ibland övervakning av beväpnade vakter) för barbarer utifrån som ville korsa gränsen för att sälja sina varor på de romerska marknaderna – en bild som man nästan känner igen från vår tids fria handel inom EU.
 
Romarna byggde murar för att hålla barbarerna ute | National Geographic

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