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The Portuguese only understood the nature of his mission after they arrived in Ethiopia in 1520 , shortly after Mateus ' death , a fact that complicated their mission to the new Ethiopian Emperor .
 Ethiopia, Mateus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ethiopia, Mateus