▁any ▁population ▁groups ▁other ▁than ▁the ▁B ant u ▁in ▁the ▁modern ▁day ▁population . ▁ ▁They ▁expected ▁to ▁find ▁evidence ▁of ▁combined ▁ancest ry . ▁ ▁This ▁makes ▁it ▁difficult ▁to ▁explain ▁the ▁existence ▁of ▁an ▁earlier ▁population , ▁save ▁that ▁they ▁were ▁completely ▁and ▁rapidly ▁replaced ▁by ▁the ▁B ant u ▁speak ers ▁without ▁inter mar riage ▁( although ▁inter mar riage ▁may ▁have ▁occurred ▁in ▁the ▁central ▁parts ▁of ▁Ang ola ). ▁Also , ▁part ▁of ▁the ▁K ho isan ▁with d rew ▁to ▁what ▁is ▁now ▁Southern ▁Ang ola ▁as ▁well ▁as ▁Northern ▁B ots w ana ▁and ▁Northern ▁Nam ib ia , ▁where ▁significant ▁groups ▁are ▁still ▁living . ▁▁ 1 5 th ▁century ▁The ▁Portuguese ▁established ▁themselves ▁on ▁the ▁west ▁coast ▁of ▁Africa ▁towards ▁the ▁close ▁of ▁the ▁ 1 5 th ▁century . ▁Di ogo ▁C ão ▁found ▁the ▁K ongo ▁Kingdom ▁and ▁the ▁Congo ▁River ▁in ▁ 1 4 8 2 . ▁He ▁ere cted ▁a ▁stone ▁pill ar ▁at ▁the ▁mouth ▁of ▁the ▁river , ▁which ▁accordingly ▁took ▁the ▁title ▁of ▁Rio ▁do ▁P adr ão . ▁He ▁ex changed ▁host ages ▁with ▁the ▁local ▁people , ▁who ▁reported ▁that ▁the ▁country ▁was ▁subject ▁to ▁a ▁great ▁monarch , ▁Man ik ongo ▁or ▁lord ▁of ▁the ▁Kingdom ▁of ▁K ongo , ▁resident ▁at ▁M ban za ▁K ongo . ▁He ▁reached ▁the ▁Ang olan ▁coast ▁in ▁ 1 4 8 4 . ▁ ▁The ▁Portuguese ▁entered ▁into ▁a ▁co oper ative ▁relationship ▁with ▁the