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The sole account of the persecution is a letter preserved by Eusebius , supposedly written by the Christians of Lyon and Vienne , the latter still known then as Vienna Allobrogum and the capital of the continental Celtic Allobroges .
 Eusebius, Lyon, Vienne
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Eusebius, Lyon, Vienne