324237
He had married the daughter of Rockingham 's stud groom and had a son , another John Singleton , who won the 1897 renewal of the Derby .
 person: Rockingham
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: Rockingham 
Answer:
 person: Rockingham