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With the rise of the pro- Chalcedonian Justin I ( r. 518 – 527 ) to the imperial throne in 518 and the subsequent re-imposition of Chalcedonian orthodoxy throughout the Empire , however , the staunchly Monophysite Ghassanids withdrew from the alliance in circa 520 and retreated into the northern Hejaz .
 person: Justin I; location: Empire
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Justin I, Empire 
Answer:
 person: Justin I; location: Empire