51905
Background Hephestion was a bay horse bred by his owner Robert Grosvenor , 2nd Earl Grosvenor .
 Robert Grosvenor , 2nd Earl Grosvenor
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robert Grosvenor , 2nd Earl Grosvenor