368433
The Portuguese were interested in trade , mainly slave trade ; thus they maintained a peaceful and mutually profitable relationship with the rulers and dominant social segment of the Kongo Kingdom , whom they Christianized and taught reading and writing in Portuguese , allowing them a share of the benefits from the slave trade .
 Portuguese, Portuguese
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Portuguese, Portuguese