Nubians were the inhabitants of Nubia, the country south of Egypt. It became civilized during the period of the Egyptian Old Kingdom, with an Egyptian-derived culture (there are more pyramids in Nubia than Egypt). Their contact with Egypt was extensive, since they were the source of most Egyptian Gold. At times they rivaled and even surpassed Egyptian power, with one Egyptian Dynasty actually consisting of Nubian Pharaohs. Racially the Nubians were Nilotic people, with Black skins and Hamitic features. They were Christianized from Egypt during the early Christian era, and held out against Islam for hundreds of years after the fall of Egypt. Their territory is now the Sudan, although it was much less dry during that period. The Christian people of souther Sudan include their descendants. Verdi's opera Aida is based on the history of Egyptian - Nubian conflict, and Aida herself is a Nubian.
There are more pyramids in Mexico than all the rest of the world combined.