Algernon Percy, 10th. Earl of Northumberland
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- 1  Algernon Percy, 10th. Earl of Northumberland [1]  b. 29 Sep 1602 d. 13 Oct 1668
             - 2  Joscelyn Percy, 11th. Earl of Northumberland [1.1]   
 b. 4 Jul 1644 d. 21 May 1670
                    
                             - 3  Lady Elizabeth Percy [1.1.1]   
 b. 26 Jan 1667 d. 23 Nov 1722
                                    
  Charles Seymour, 6th. Duke of Somerset  b. 13 Aug 1662 d. 2 Dec 1748
- 4  Catherine Seymour [1.1.1.1]   
 b. 1693 d. 9 Apr 1731
[ =>]                                                 
- 4  Catherine Seymour [1.1.1.1]   
 
 
- 3  Lady Elizabeth Percy [1.1.1]   
 
 
- 2  Joscelyn Percy, 11th. Earl of Northumberland [1.1]   
 
 
