Popular Egyptian culture stereotyped Sudanese as a servant class within the empire.

Evidence

Given the Sudan’s political significance at this time, it is crucial to explore how the Sudanese in Egypt became the source of many jokes, stereotypes, and caricatures. As we shall see, in popular and print culture the Sudanese were often portrayed as no more than an empire of domestics. — Eve M. Troutt Powell, A Different Shade of Colonialism_…, 57