Esther 1:3

Media : a country on the SW coast of the Caspian Sea
(34° 47´, 48° 30´)

Persia : citizen(s) of Persia
(34° 47´, 48° 30´)

Esther 1:16

Ahasuerus : king of Persia after Darius

Memucan : one of the seven princes of Persia under Ahasuerus

Vashti : queen of Ahasuerus