| Honorific-Prefix: | The Right Honourable |
| The Earl Fauconberg | |
| Honorific-Suffix: | PC |
| Office1: | Lord Lieutenant, North Riding |
| Term Start1: | 1660 |
| Term End1: | 1687 |
| Monarch1: | Charles II James II |
| Office2: | Envoy to the Republic of Venice |
| Monarch2: | Charles II |
| Term Start2: | 1669 |
| Term End2: | 1672 |
| Office3: | Special Envoy to France |
| Monarch3: | Commonwealth of England |
| Term Start3: | 1658 |
| Term End3: | 1659 |
| Birth Date: | ca 1627 |
| Birth Place: | Newburgh Priory, Yorkshire |
| Death Place: | Sutton House, London |
| Restingplace: | St Michael's, Coxwold |
| Nationality: | English |
| Spouse: | Mildred Saunderson Mary Cromwell (1637-1713) |
| Parents: | Henry Belasyse (1604–1647) Grace Barton |
| Occupation: | Politician, diplomat |
Thomas Belasyse, 1st Earl Fauconberg PC (c. 1627 - 31 December 1700) was an English peer.[1] He supported the Parliamentary cause in the English Civil War, becoming close to Oliver Cromwell and marrying Cromwell's third daughter, Mary. After the Restoration of the monarchy he became a member of the Privy Council to Charles II and was elevated to an earldom by William III.
Belasyse was the only son of Henry Belasyse, and Grace Barton; his grandfather, Thomas Belasyse, 1st Viscount Fauconberg, was a Royalist, who went into exile after being defeated at Marston Moor in 1644.
Unlike his Royalist father and grandfather, Belasyse supported Parliament in the English Civil War, and subsequently became a strong adherent of Oliver Cromwell, whose third daughter, Mary, he married in 1657. His father died in 1647 and he succeeded his grandfather to the viscounty of Fauconberg in the Bishopric of Durham in 1652.
Belasyse again became a Royalist at the Restoration of the monarchy, and was appointed a member of the Privy Council of England by Charles II and Captain of the Guard (in which office he succeeded his uncle Lord Belasyse). He also served as English ambassador in Venice. He was Lord Lieutenant of the North Riding of Yorkshire (1660 - 1692), with responsibility for the North York Militia, personally commanding one of the Troops of Horse.[2] He was one of the noblemen who joined in inviting William of Orange to England, and was by that king created Earl Fauconberg, in the Peerage of England, on 9 April 1689.
Fauconberg died on 31 December 1700, and was buried in the family vault in Coxwold. He had no children; on his death, the earldom became extinct, but his viscountcy passed to his nephew, Thomas Belasyse, 3rd Viscount Fauconberg.
On 3 July 1651 Fauconberg married Mildred, daughter of Nicholas Saunderson, 2nd Viscount Castleton. She died 8 May 1656.[3] On 18 November 1657, he married Mary Cromwell, the third daughter of Oliver Cromwell.[4] She outlived her husband by thirteen years dying on 14 March 1713.[5]
While he was in Italy, Fauconberg translated and published the Histoire du gouvernement de Venise, by Abraham Nicolas Amelot de la Houssaye.[6]
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