Vungu
The kingdom of Vungu or Bungu was a historic state located in Mayombe (between the present-day Republic of Congo and the present-day Democratic Republic of Congo). In the 13th century it led a confederation of itself, Ngoyo, and Kakongo. It neighboured the confederations of Mpemba and Seven Kingdoms of Kongo dia Nlaza. It is thought to be the origin of the Kingdom of Kongo.: 24–25