| Honorific Prefix: | The Right Honourable |
| The Earl of Essex | |
| Honorific Suffix: | KG PC |
| Office: | Lord Lieutenant of Hertfordshire |
| Term Start: | 1722 |
| Term End: | 1743 |
| Predecessor: | The 1st Earl Cowper |
| Successor: | The 2nd Earl Cowper |
| Birth Name: | William Capell |
| Birth Date: | 11 January 1697 |
| Parents: | Algernon Capell, 2nd Earl of Essex Lady Mary Bentinck |
| Spouse: | |
| Children: | Lady Charlotte Capell Lady Mary Capell William Capell, 4th Earl of Essex |
William Capell, 3rd Earl of Essex, (11 January 16978 January 1743) was an English courtier and diplomat.[1]
He was the son of the 2nd Earl of Essex and Lady Mary Bentinck.[2] His younger sister, Lady Mary Capel, married Alan Brodrick, 2nd Viscount Midleton. After his father's death, his mother remarried Rt. Hon. Sir Conyers Darcy (d. 1758), son of Hon. John Darcy.
His paternal grandparents were Arthur Capell, 1st Earl of Essex and Lady Elizabeth Percy (a daughter of Algernon Percy, 10th Earl of Northumberland). His mother was the eldest daughter of William Bentinck, 1st Earl of Portland and Anne Villiers (the fourth daughter, by his first wife, of Sir Edward Villiers, Knight Marshal of the Royal Household).
Capell was one of the founding governors of the charity, the Foundling Hospital, created in October 1739 to care for abandoned children.[3]
Lord Essex was a Gentleman of the Bedchamber to the Prince of Wales from to 1727; Lord Lieutenant of Hertfordshire from 1722 to . He was made a Knight of the Thistle on 2 February 1724 but resigned in 1738. He served as Ranger of St James's Park from 1727 to 1739 and Ranger of Hyde Park from 1728 to 1739.
He served as the British Ambassador to Turin from 1732 to 1737. He was made a Privy Councillor, a Knight of the Garter, and was Captain of the Yeomen of the Guard from 1739 until his death in 1743.
On 27 November 1718, Capell married Lady Jane Hyde, a Lady of the Bedchamber to the Princess of Wales and the third daughter of the 4th Earl of Clarendon. Before Lady Jane died in 1724, they were the parents of two children:
On 3 February 1726, William was married to Lady Elizabeth Russell, a daughter of the 2nd Duke of Bedford and the former Elizabeth Howland (daughter and heiress of John Howland of Streatham). Together, they had one surviving son:
Lord Essex died on 8 January 1743. His titles and estates were inherited by his ten-year-old son, William.[4]
Through his second daughter, he was a grandfather of two girls, Maria Eleanor Forbes who married John Villiers, 3rd Earl of Clarendon, and Katherine Elizabeth Forbes who married William Wellesley-Pole, 3rd Earl of Mornington.