This paper considers the career of the Uruguayan Benjamín Fernández y Medina, who represented his country in Spain as minister plenipotentiary between 1917 and 1930 before being transferred to Havana. Those of Fernández Medina's diplomatic activities that were strictly tied to bilateral relations, which here are only studied in a tangential sense, took on a transnational dimension as the Uruguayan began to represent his country in Portugal and at the Assembly of the League of Nations while still being based in Spain. [ABSTRACT FROM AUTHOR]