Sometime 1482-83 the Portuguese navigator Diogo Cão became the first European to reach the kingdom of Kongo (Wikipedia: Kingdom of Kongo). The Portuguese had an active presence in the region until 1975.
Today the area covers three modern countries – the Democratic Republic of the Congo, Angola and the Congo Republic. At the time of Portuguese expansion several kingdoms already existed in the area (Wikipedia: Precolonial History of Angola) although these coalesced into the Kingdom of Kongo and the Colony of Angola.
|Kongo||Mouth of the River Congo.||Through our period the Kingdom of Kongo fairly successfully resisted the Portuguese. However, Kingdom of Kongo was finally reduced to a small enclave in the north of Angola with king Pedro V in 1888 finally accepting to become a vassal of the Portuguese. The Portuguese abolished the kingdom after the revolt of the Kongolese in 1914.|
|Ndongo||In the interior of Angola east of Luanda, in the highlands between the Kwanza and Lukala Rivers.||Although Kongo claimed control of Ndongo as early as 1535 the latter was probably never under a firm Kongo administration. The Portuguese colony of Angola ultimately extinguished Ndongo as an independent nation.|
|Matamba||Fought on into the 18th Century.|
|Kongo dia Nlaza||East of Kongo|
|Nziko||East of Kongo|
|Benguela||On the front range of the Bihe Plateau|
|Songo||South of Ndongo|
Note: I assume Angola is based on the local word Ngola which was both a name and a title in Ndongo.