Lewknor was descended from the senior surviving line of a family seated in Sussex since the thirteenth century and which had first represented the county in 1335. His father, Thomas Lewknor, acquired through his wife a lease of the demesne lands and park of Selsey, a Crown manor near Chichester, where he had settled. Despite their Catholic sympathies, Thomas and his brother Richard† were the dominant justices in the Chichester rape in the 1580s.
Lewknor himself served with the Spanish army in the Netherlands under the duke of Parma, married a Flemish wife, and rose to the rank of captain. Severely wounded in his right arm in 1587, he was subsequently unable to continue in his profession. Since he was also disappointed in his wife’s dowry, he gave himself up in 1590 to Sir Robert Sidney†, the governor of Flushing, who found him ‘a proper civil man’. Lewknor paid his passage by informing on other Catholic exiles, and in his Estate of English Fugitives (1595) described the Spaniards as ‘in their hearts pagans and Moors’.
Lewknor’s uncle, now chief justice of Chester and a prominent member of the Council in the Marches, secured his return for Bridgnorth to the first Jacobean Parliament. He made five recorded speeches, all in the opening session, and received 37 committee appointments between 1604 and 1610. He was named to the committee for privileges on 22 Mar. 1604 and was among those appointed to consider the grievances raised by Sir Edward Montagu the following day.
Lewknor’s first recorded speech came on 5 May, when he was one of the disputants who spoke in the debate on religion initiated by Sir James Perrot, although his words were unrecorded.
Lewknor’s principal legislative interest in the 1604 session seems to have concerned a bill to void a ‘release unduly procured’ between Anthony Penning, a Suffolk justice resident in Ipswich, and the latter’s brother, Edmund.
Assessed for the Privy Seal loan in August, Lewknor told Lord Cecil (Robert Cecil†) that his ‘poor estate’ made it impossible for him to contribute.
In the second session Lewknor was appointed to consider four bills, including one on the Marshalsea Court (21 Mar.), which had jurisdiction over the royal Household, and another to attend the conference with the Lords on 6 Feb. 1606 concerning the recusancy laws.
In the third session Lewknor was named to attend the Union conference of 25 Nov. 1606. He was added to the committee to consider the revived bill for reforming the Marshalsea Court on 21 Feb., which may have been of greater interest to him now as he was a commissioner for oyer and terminer for the Household. His only other appointment, seven days later, was to consider ‘the cruelties and wrongs of the Spaniards’. He was obviously well qualified for this task, but was already regarded by the foreign ambassadors in London as pro-Spanish, and it was during this session that one of his sons was reported to have made open profession of Catholicism in France.
In 1609 Lewknor was granted the goods of a convicted felon.
In 1611 Lewknor’s younger son, Thomas, became a Jesuit in circumstances of even greater secrecy than usual, ‘his father ... being morally sure to lose his place (which is worth unto him £1,000 a year, and his estate not great besides it)’.
Following the collapse of the negotiations for a Spanish Match for Prince Charles in 1623, Lewknor increasingly came under suspicion. In 1624 he and his third wife were presented by Parliament as ‘justly suspected to be popish recusants’.
