General Algernon Seymour, 7th Duke of Somerset (11 November 1684 – 7 February 1750) was the son of Charles Seymour, 6th Duke of Somerset

Charles Seymour, 6th Duke of Somerset

Charles Seymour, 6th Duke of Somerset , sometimes referred to as the "Proud Duke". The son of Charles Seymour, 2nd Baron Seymour of Trowbridge, and Elizabeth Alington , he succeeded his brother Francis Seymour, 5th Duke of Somerset, to the dukedom when the latter was shot in 1678...

 and his wife, Elizabeth

Elizabeth Seymour, Duchess of Somerset

Elizabeth Percy, Duchess of Somerset , major heiress, was born Lady Elizabeth Percy, the only surviving child of the 11th Earl of Northumberland and deemed Baroness Percy in her own right. She carried the earldom of Northumberland to her son Algernon...

. He was styled Earl of Hertford until he succeeded to the Dukedom in 1748.

In 1713, he married Frances Thynne, one of the daughters of Henry Thynne

Henry Thynne (1675–1708)

Henry Thynne was an English gentleman and Tory Member of Parliament.Thynne was the eldest of the three sons of Thomas Thynne, 1st Viscount Weymouth , of Longleat, a substantial landowner in Wiltshire and Gloucestershire, by his marriage to Lady Frances Finch, a daughter of Heneage Finch, 3rd Earl...

 (1675–1708) and a granddaughter of Thomas Thynne, 1st Viscount Weymouth, and with her had two children:

• George Seymour, Viscount Beauchamp (11 September 1725 – 11 September 1744), died young.
• Elizabeth Seymour (1730 – 5 December 1776), married Sir Hugh Smithson 4th baronet later Earl of Northumberland in her right
  Hugh Percy, 1st Duke of Northumberland
  Hugh Percy, 1st Duke of Northumberland, KG, PC was an Engish peer, landowner and art patron.He was born Hugh Smithson, the son of Langdale Smithson and grandson of Sir Hugh Smithson, 3rd Baronet from whom he inherited the baronetcy in 1733...
  
   and had issue.

The Duke was one of the richest landowners in England, but as he died with no son his estates were split after his death. The ducal title passed to a distant cousin Edward Seymour, 8th Duke of Somerset

Edward Seymour, 8th Duke of Somerset

Edward Seymour, 8th Duke of Somerset was a British nobleman....

. Most of the traditional Percy estates passed to his daughter and her husband (see Alnwick Castle

Alnwick Castle

Alnwick Castle is a castle and stately home in the town of the same name in the English county of Northumberland. It is the residence of the Duke of Northumberland, built following the Norman conquest, and renovated and remodelled a number of times. It is a Grade I listed building.-History:Alnwick...

, Northumberland House

Northumberland House

Northumberland House was a large Jacobean mansion in London, which was so called because for most of its history it was the London residence of the Percy family, who were the Earls and later Dukes of Northumberland, and one of England's richest and most prominent aristocratic dynasties for many...

 and Syon House

Syon House

Syon House, with its 200-acre park, is situated in west London, England. It belongs to the Duke of Northumberland and is now his family's London residence...

). Petworth

Petworth House

Petworth House in Petworth, West Sussex, England, is a late 17th-century mansion, rebuilt in 1688 by Charles Seymour, 6th Duke of Somerset, and altered in the 1870s by Anthony Salvin...

 in Sussex passed to the duke's nephew Charles Wyndham, 2nd Earl of Egremont

Charles Wyndham, 2nd Earl of Egremont

Charles Wyndham, 2nd Earl of Egremont, PC and Catherine née Seymour, succeeded his uncle, Algernon Seymour, 7th Duke of Somerset, as 2nd Earl of Egremont in 1750...

. Later dukes of Somerset lived at Maiden Bradley

Maiden Bradley

Maiden Bradley with Yarnfield is a small Wiltshire civil parish near the Somerset border and the home of the Duke of Somerset. The B3092 road that joins Frome to Mere runs through the middle of the village of Maiden Bradley....

, a far more modest estate than those already mentioned.