Sir Thomas was admitted to The Middle Temple, June 9, 1591 and married Elizabeth, daughter of Sir Nathaniel Bacon of Stiffkey, Suffolk, in 1592. He was knighted by King James I in 1603 and died September 1, 1605 at Stradbroke, Suffolk, England.

National Archives (UK)
Reference: KNY 461 371 x 9
Agreement
Between John Sedley gent. of London and Sir Thomas Knyvett of Ashwellthorpe, Martin Sedley Esq. of Morley and Thomas, son of Sir Thomas Knyvett by which John Sedley agreed to take £330 in lieu of £300 in which the others were bound to him by recognizance of statute staple, (1590).

Reference: Phi/613/3 578 x 6
Extract from Feltwell St. Mary parish register re burial of Sir Thomas Knyvett, (September 26,1605).

Reference: Phi/552 578 x 3
Inventory of goods of Thomas Knyvett jun. knight of Ashwellthorpe deceased, taken November 18, 1605 and exhibited 8th December 8, 1610, (1605-1610).

Reference: Phi/553 578 x 3
Mandate of the Archbishop of Canterbury relaxing sentence of excommunication against Sir Thomas Knyvett sen. concerning administration of the estate of Sir Thomas Knyvett jun., (May 28, 1611).

Reference: KNY 477 372 x 1
Bargain and Sale
From Thomas Knyvett Esq. of Ashwellthorpe to Dame Elizabeth Knyvett of Stiffkey widow of Thomas Knyvett jun. of life interest in Hapton Hall and lands in Hapton, Wreningham and Nelond, excepting 35 acres next Ashwellthorpe park, in pursuance of Chancery decree compelling the payment of her jointure, (1619).

Reference: KNY 613 372 x 5
Elizabeth Pettus (daughter of Sir Thomas Knyvett jun.)
Family news, (nd).