Though often overshadowed by its Egyptian neighbors to the north, the Kingdom of Kush stood as a regional power in Africa for over a thousand years. This ancient Nubian empire reached its peak in the second millennium B.C., when it ruled over a vast swath of territory along the Nile River in what is now Sudan. Almost all that is known about Kush comes from Egyptian sources, which indicate that it was an economic center that operated a lucrative market in ivory, incense, iron and especially gold.