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He first appears in the historical sources in 498 during the reign of Byzantine emperor Anastasius I ( r. 491 – 518 ) , when , according to Theophanes the Confessor , the Diocese of Oriens suffered from large-scale Arab raids .
 Byzantine, Anastasius I, Theophanes the Confessor
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Byzantine, Anastasius I, Theophanes the Confessor