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Emperors Constantine and Valentinian safeguarded the frontier by constructing fortresses in Koblenz are ( " Confluentes " ) and Boppard ( " Bodobrica " ) with strong walls and round towers , of which remnants remain .
 person: Constantine; person: Valentinian; location: Koblenz; location: Confluentes; location: Boppard; location: Bodobrica
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: Constantine, Valentinian, Koblenz, Confluentes, Boppard, Bodobrica 
Answer:
 person: Constantine; person: Valentinian; location: Koblenz; location: Confluentes; location: Boppard; location: Bodobrica