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which disguised the political significance behind the choice , as these had been the colours present on the banners of the rebellious during the republican insurrection of 31 January 1891 , in Porto , and during the monarchy-overthrowing revolution , in Lisbon .
 Porto, Lisbon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Porto, Lisbon