[1] He had previously inherited half of the enormous fortune of his uncle Sir Charles Duncombe.
He represented East Retford and the North Riding of Yorkshire in the House of Commons as a Conservative.
[3] He was succeeded by his grandson, the second Earl, who sat in Parliament as a Conservative representative for Thirsk and Malton.
However, he was succeeded in the barony of Feversham by his distant relative (his fourth cousin), the sixth Baron.
The aforementioned Sir Charles Duncombe, uncle of the first Baron of the 1747 creation, was a wealthy banker.
The Honourable Octavius Duncombe, younger son of the first Baron, represented the North Riding of Yorkshire in Parliament.