William Capell, 3rd Earl of Essex
He was the son of the 2nd Earl of Essex.
- Charlotte Capell (d. 1790), married Thomas Villiers, 1st Earl of Clarendon, and had issue.
- Lady Mary Capell (d. 9 Apr 1782), married Admiral Hon. John Forbes (a son of George Forbes, 3rd Earl of Granard). They had two daughters, Maria Eleanor Forbes who married John Villiers, 3rd Earl of Clarendon, and Katherine Elizabeth Forbes who married William Wellesley-Pole, 3rd Earl of Mornington.
Lady Jane died in 1724 and William married Lady Elizabeth Russell, a daughter of the 2nd Duke of Bedford on 3 February 1726 and they had one living son, William Anne Capell, 4th Earl of Essex (1732–1799) who married Frances Hanbury Williams.
- Cassiobury Collection, Watford Museum, http://cassiobury.watfordmuseum.org.uk/tree.html
The Duke of Manchester
| Captain of the Yeomen of the Guard
The Lord Berkeley of Stratton
The 1st Earl Cowper
| Lord Lieutenant of Hertfordshire
Title next held byThe 2nd Earl Cowper
|Peerage of England|
| Earl of Essex
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