This paper demonstrates, by presenting a new Linked Open Data (LOD) service and semantic portal LEAGUE OF NATIONS SAMPO, how semantic web technologies can be used in Digital Humanities (DH) research to search, browse, and analyze assembly minutes of multilateral international organizations and their representatives. For the first time, this wealth of historical documentation is now openly available as FAIR LOD for DH research and practical application development, as demonstrated by the new EAGUE OF NATIONS SAMPO portal.