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Galerius sent Severus against Maxentius , but during the campaign , Severus ' armies , previously under command of Maxentius ' father Maximian , defected , and Severus was seized and imprisoned .
 Galerius, Severus, Maxentius, Severus, Maxentius, Maximian, Severus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Galerius, Severus, Maxentius, Severus, Maxentius, Maximian, Severus