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She was the younger sister of emperor Caligula , the niece and fourth wife of emperor Claudius who succeeded Caligula , and the mother of emperor Nero , who succeeded Claudius .
 Caligula, Claudius, Caligula, Nero, Claudius
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Caligula, Claudius, Caligula, Nero, Claudius