How do you find a republic that never existed ? During the 1950s Cold War, U.S Army cryptologist Lambros D. Callimahos created the mythical  “Republiko of Zendia” to use in wargaming for U.S. military intelligence codebreakers simulating the invasion of Cuba.

The original map of Zendia now hangs on the wall of the library at the National Cryptologic Museum. The “Zendian problem,” in which cryptanalysts students were asked to interpret intercepted Zendian radio messages, formed part of an advanced course that Callimahos taught to NSA cryptanalysts in the 1950s. Graduates of the course were admitted to the “Dundee Society,” named for an empty marmalade jar in which Callimahos kept his pencils.