Freedonia (nation)

Freedonia was a fictional nation primarily associated with Martha Jones. The Tenth Doctor once told William Shakespeare that Martha Jones was a citizen of the nation of "Freedonia", in an effort to explain away her differences from the women of Shakespeare's acquaintance. (DW: The Shakespeare Code) Later, while visiting the Lake District in September 1909, Martha again claimed to be from Freedonia. (NSA: Sting of the Zygons)

Behind the scenes
"Freedonia" is a generic name for a plausible-sounding but fictional country, popularised by the Marx Brothers film Duck Soup. Its use in The Shakespeare Code was intended as a reference to. (DWA #49, REF: Doctor Who: The Encyclopedia)