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The practice of burying national figures in the abbey began under Oliver Cromwell with the burial of Admiral Robert Blake in 1657 .
 Oliver Cromwell, Robert Blake
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:
 Oliver Cromwell, Robert Blake