Thomas Knyvett, also spelt Knevit, was born at Ashwellthorpe, Norfolk. He married Mary Wolverton, born c1520, in Wolverton, Suffolk, c1548. He is believed to have died at Rosmain, Cornwall, England.

National Archives (UK)
Reference: KNY 432 371 x 9
Release
By Thomas Knyvett Esq. of Buckenham Castle of John Knyvett Esq. of Ashwellthorpe from covenants in an agreement, (June 20, 1550; October 6, 1551).

Reference: HIL/1/11, 869 x 8
Grant by Thomas Knyvett of Buckenham Castle to Arthur Williams and Anthony his son of the next presentation to the rectories of Attleborough, Stanhoe and Hilborough and the vicarage of Mendlesham, Suffolk, (1565).

Reference: KNY 459 371 x 9
Bond of Sir Thomas Knyvett of Ashwellthorpe to Henry Knyvett of Budock (co. Cornwall) for payment of £20, (1579).

British Libray of Manuscripts
Reference: Eg. 2713 f. 33
Knyvett (Henry). nephew of Thos. Knyvett. Receipt of moneys for the use of 1566.