History of Sudan
The modern Republic of Sudan was formed in 1956 and inherited its boundaries from Anglo-Egyptian Sudan, established in 1899. For times predating 1899, usage of the term "Sudan" for the territory of the Republic of Sudan was somewhat anachronistic, and may have referred to the more diffuse concept of the Sudan.
List of ambassadors of the United Kingdom to South Sudan
South Sudan became an independent state on 9 July 2011 and the British Consulate General in the capital, Juba, was upgraded to a sovereign Embassy.