1525
The last ruler in the region was probably Subhagasena ( Sophagasenus of Polybius ) , who , in all probability , belonged to the Ashvaka ( q.v. ) background .
 Subhagasena, Sophagasenus, Polybius
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Subhagasena, Sophagasenus, Polybius