Emperor Nero around 61 AD sent a small group of praetorian guards to explore the sources of the Nile River in Africa. He did this in order to obtain information for a possible conquest of Ethiopia, as was called Equatorial Africa (and everything south of Egypt) by the Romans. The Roman legionaries navigating the Nile from southern Egypt initially reached the city of Meroë and later moved to the Sudd, where they found huge difficulties in going further.