71203
In the year 9 , Augustus ordered and forced Tiberius to adopt Germanicus , who happened to be Tiberius 's nephew , as his son and heir .
 Augustus, Tiberius, Germanicus, Tiberius
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Augustus, Tiberius, Germanicus, Tiberius