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The 7th century saw a struggle for hegemony between Northumbria and Mercia , which in the 8th century gave way to Mercian preeminence .
 location: Northumbria; location: Mercia; location: Mercian
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: Northumbria, Mercia, Mercian 
Answer:
 location: Northumbria; location: Mercia; location: Mercian