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This style of presentation was not new " – many of its elements were first seen in the reigns of Aurelian and Severus " – but it was only under the tetrarchs that it was refined into an explicit system .
 person: Aurelian; person: Severus
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Aurelian; person: Severus