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.
Sultan of Egypt
Upon overthrowing Fuad's son, King Farouk I, in the Egyptian Revolution of 1952, the Free Officers briefly considered declaring his infant son Sultan to reinforce Egypt's sovereignty over Sudan and demonstrate their rejection of British occupation. However, since the revolutionaries had already decided to abolish the Egyptian monarchy after a brief period of consolidating their hold on power, they determined that it would be an idle gesture and Farouk's son was duly declared King Fuad II. The following year, on 18 June 1953, the revolutionary government officially abolished the monarchy and Egypt became a republic.