144714
During the late Middle Ages , it formed the core of the Empire of Trebizond until its fall to the Ottomans in 1461 .
 location: Ottomans
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: Ottomans 
Answer:
 location: Ottomans