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Gaspare Murtola ( d. 1624 or 1625 ) was an Italian poet and writer of madrigal s. He is known for a bitter literary feud with Giambattista Marino , carried out " with sonnet s , invective s , and pistol shots , " and for references he makes in his poetry to art works by Caravaggio .
 Giambattista Marino, Caravaggio
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Giambattista Marino, Caravaggio