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In 1810 , the May Revolution had forced the Spanish to abandon Buenos Aires , but they held on to the Banda Oriental ( present-day Uruguay ) , as Francisco Javier de Elío moved the headquarters of his Viceroyalty of the Río de la Plata to Montevideo .
 Francisco Javier de Elío, Montevideo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Francisco Javier de Elío, Montevideo