343529
On 14 September 1815 , he married Lady Matilda Stewart , daughter of Robert Stewart , 1st Marquess of Londonderry , and had by her a daughter and a son .
 person: Stewart; person: Robert Stewart , 1st Marquess of Londonderry
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: Stewart, Robert Stewart , 1st Marquess of Londonderry 
Answer:
 person: Stewart; person: Robert Stewart , 1st Marquess of Londonderry