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Tiberius and Augustus had both left gifts to the army and guard in their wills , and upon Caligula 's death the same would have been expected , even if no will existed .
 Tiberius, Augustus, Caligula
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tiberius, Augustus, Caligula