The Lewknors had been prominent among the gentry of Sussex since the late thirteenth century, when Roger Lewknor married the heiress of the Keynes family. He died in 1295 in possession of the manors of Selmeston, Itford and Horsted Keynes in the east of the county, which, together with Broadhurst (close to Horsted Keynes), and Gretworth, far away in Northamptonshire, all eventually passed to our MP as a direct descendant. While Horsted Keynes was the Lewknors’ principal home in Sussex, they also frequently resided at their manor-house at South Mimms in Middlesex, which had also been in the family’s possession since the late thirteenth century, and Sir Thomas’s great-grandfather, Sir Roger Lewknor† (d.1362), represented both counties in Parliaments summoned by Edward III.
Roger Lewknor died on 10 Nov. 1400, while his son and heir was still a minor,
Well before he attained his majority, Thomas also fell heir not only to the combined Lewknor and d’Oyley estates but also to the substantial properties once belonging to Henry, 3rd Lord Tregoz (d.1361), for although the latter left eight children his legitimate line ended in 1404 on the death of his last surviving son John, whose five offspring were all bastards. Lewknor (whose grandmother Joan d’Oyley was Lord Henry’s niece) was thus his lawful heir. The valuable Tregoz estates, consisting of nine manors in Sussex, another in Kent, and Le Hertshead, an inn in Southwark, were then in the possession of feoffees, or else assigned in dower to a Tregoz widow. An attempt to eject the feoffees from these and other manors in 1408 resulted in their successful recovery of 300 marks in damages; on the other hand they were amerced for wrongly accusing young Lewknor and others of being party to the alleged disseisin.
In 1415, the year after he came of age, Lewknor embarked for Normandy with Henry V’s army, as an esquire in the retinue of Thomas Fitzalan, earl of Arundel, the leading magnate in his home county. It would appear that he was knighted on the campaign, perhaps even on the field at Agincourt, for although many of his fellows, including their commander, were repatriated after falling sick at the siege of Harfleur, there is no record that he himself returned home until after the victory.
In view of his wealth and standing it is not surprising that Lewknor was frequently appointed to ad hoc commissions of local government, and as a member of the Sussex bench for over 30 years. There is no evidence that he again took part in Henry V’s wars in France, although he was listed among the men of Surrey considered best suited for military service in defence of the realm early in 1420. He was present at the coronation of Katherine de Valois on 24 Feb. 1421, wearing the scarlet livery issued by the royal wardrobe for the ceremony.
Lewknor’s closest associates continued to be drawn from the leading families of Sussex and Kent to whom he was linked by ties of kinship. Shortly before his second Parliament, he had been asked by his wife’s cousins the brothers Sir Roger*and James Fiennes* to be a feoffee of their family estate in Oxfordshire, and in the winter of 1427-8 he witnessed their acquisition of Hever. By that date, too, he had established friendly relations with the wealthy and influential Sir John Pelham*, who called upon him in 1428 to witness the safe transfer of his moveable goods to his wife, his bastard son Sir John the younger (Queen Katherine’s chamberlain) and the bishop of Durham, and his grant to the same son of the rape of Hastings and specified manors there.
It may be that Lewknor’s links with Lord Poynings played a part in the negotiations to secure a potentially lucrative and highly prestigious marriage for his first son, Roger, still a mere boy, for the bride, Eleanor Camoys, was Poynings’ niece. She, a grand-daughter of Thomas, Lord Camoys, who had commanded the left wing at Agincourt, became a coheiress of his estates following the death of her brother Lord Hugh in 1426. In February 1428 Lewknor entered a formal agreement with Ralph Rademylde†, the husband of Eleanor’s sister and coheiress, for an equitable division of the profits and costs arising since Hugh’s death, but £30 remained outstanding when Lewknor died many years later, and his widow had to sue Rademylde’s executor to recover it. In 1433 Lewknor witnessed the quitclaim of various Sussex manors made to Roger and Eleanor by her uncle, Roger, Lord Camoys, and it seems very likely that he had been party to the settlement of their differences.
Lewknor was frequently named in the wills of his contemporaries. In the 1430s he had supervised that of his former father-in-law Nicholas Carew, as well as acting as a feoffee on behalf of Carew’s widow;
Lewknor died on 22 June 1452, leaving as his heir Roger, the eldest of his six surviving sons, born of his marriage to Philippa Dallingridge.
