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Maxentius prepared for the same type of war he had waged against Severus and Galerius : he sat in Rome and prepared for a siege .
 Maxentius, Severus, Galerius, Rome
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Maxentius, Severus, Galerius, Rome