Although Kongo and Portugal had been trading partners and participated in a cultural exchange during the sixteenth century, the establishment of the Portuguese colony of Angola in 1575 put pressure on that relationship. Kongo initially assisted Portugal in Angola, sending an army to rescue the Portuguese governor Paulo Dias de Novais when his war against the nearby African kingdom of Ndongo failed in 1579. But subsequently as Portugal became stronger it began to press harder, and in 1622 severed even the cautiously friendly relationship of the earlier period when a large Portuguese army invaded southern Kongo and defeated the local forces at the Battle of Mbumbi. Pedro II, king of Kongo at the time, responded by personally leading a force at the battle of Mbamba crushing the invasion. He t