What is "kakongo"

Kakongo was a former small kingdom located on the Atlantic coast of Central Africa, in the modern-day Republic of Congo and Cabinda, Angola. It along with its southern neighbor, Ngoyo, and Loango, its neighbor on the north were important political commercial centers during the seventeenth through nineteenth centuries. The people speak a dialect of the Kikongo language and thus may be considered a part of the Bakongo ethnicity.