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Although strongly identified as an altarpiece form , triptychs outside that context have been created , some of the best-known examples being works by Hieronymus Bosch , Max Beckmann , and Francis Bacon .
 Hieronymus Bosch, Max Beckmann, Francis Bacon
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:
 Hieronymus Bosch, Max Beckmann, Francis Bacon