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Germanicus ' death caused much public grief in Rome , and gave rise to rumors that he had been murdered by Gnaeus Calpurnius Piso and Munatia Plancina on the orders of Tiberius , as his widow Agrippina the Elder returned to Rome with his ashes .
 Germanicus, Rome, Gnaeus Calpurnius Piso, Munatia Plancina, Tiberius, Agrippina the Elder, 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:
 Germanicus, Rome, Gnaeus Calpurnius Piso, Munatia Plancina, Tiberius, Agrippina the Elder, Rome