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Rulers of the African state of Ndongo
Ngola was the title for rulers of the Ndongo kingdom which existed from the sixteenth to the seventeenth century in what is now north-west Angola. The full title was "Ngola a Kiluanje", which is often shortened to simply "Ngola", hence the name of the modern country.
Mark R. Lipschutz; R. Kent Rasmussen (1989). Dictionary of African Historical Biography. University of California Press. p. 150. ISBN978-0-520-06611-3.