"Your Highness should know how our Kingdom is being lost in so many ways that it is convenient to provide for the necessary remedy, since this is caused by the excessive freedom given by your agents and officials to the men and merchants who are in these parts. That is why we need from those Kingdoms no more than some priests and a few people to teach in schools, and no other goods except wine and flour for the holy sacrament. That is why we beg of Your Highness to help and assist us in this matter, commanding your factors that they should not send here either merchants or wares, because it is our will that in these Kingdoms there should not be any trade of slaves nor outlet for them.
Concerning what is referred above, again we beg of Your Highness to agree with it, since otherwise we cannot remedy such an obvious damage. Pray Our Lord in His mercy to have Your Highness under His guard and let you do forever the things of His service. I kiss your hands many times.
Moreover, Sir, in our Kingdoms there is another great inconvenience which is of little service to God, and this is that many of our people, keenly desirous as they are of the wares and things of your Kingdoms, which are brought here by your people, and in order to satisfy their voracious appetite, seize many of our people, freed and exempt men; and very often it happens that they kidnap even noblemen and the sons of noblemen, and our relatives, and take them to be sold to the white men who are in our Kingdoms."
Excerpt of Letter from Nzinga Mbemba to Portuguese King João III, 1526