Like his uncle Benedict† and his father-in-law Sampson Lennard, Barnham was an enthusiastic antiquarian. His researches made him sceptical of the claim that his family was descended from Sir Walter Barnham of Barnham, Suffolk, a supposed Exchequer baron under Richard II, ‘because I myself have not seen that which may so absolutely assure it’.
The alderman bequeathed little to his eldest son, Martin, partly through ‘some ill fortunes at sea and bad debtors’, but mainly because he favoured his younger sons, Stephen† and Benedict, to whom he gave ‘great estates’.
Despite his own father’s indifference towards him, Martin named his eldest son, this Member, in his memory and they enjoyed an affectionate relationship. Of his match with Elizabeth Lennard, Barnham recorded that Martin ‘sought rather to give me a wife that might bring me a noble alliance, and promise the happiness of a good wife ... than to enrich himself, or his other children, by so great a portion as it is probable he might have had in divers places’. Less than two years after his marriage, Barnham returned to Hollingbourne, despite having promised to spend three years with his father-in-law at Chevening. He did not regret his decision, later writing that ‘I can reckon no part of my life spent with more contentment than it was, which must be chiefly ascribed to that goodness and sweetness of my father’s disposition’.
On James’s accession, Barnham approached his ‘noble friend and ally’ Sir John Gray to mediate with another, unnamed Scot, to procure knighthoods for himself and his father. Despite learning that he could have them for the cut price of £80 the pair, Martin would not stoop to purchase, and therefore Barnham enlisted the help of his ‘noble friend’, William Herbert, 3rd earl of Pembroke, who promised to have Martin dubbed for free. Both father and son were knighted at the Coronation.
Sometime between October 1608 and July 1609,
Barnham entered into his inheritance in December 1610. Three years later, on the death of his uncle Belknap Rudston, he also acquired the mansion at Boughton Monchelsea built by his maternal grandfather, Robert Rudston.
In 1613 Barnham arranged the funeral of Sir Thomas Waller*,
In 1614 Barnham was again returned for Grampound, but made little impact on Parliament’s proceedings. On 28 May he was one of 40 Members chosen to accompany the Speaker with a message to the king regarding the Commons’ decision to suspend business. His only bill committee appointments concerned the Court of Wards (14 May) and the debts of Sir Robert Wroth I* (28 May).
Barnham was again returned for Maidstone in 1624, and was named to the committee for privileges (23 February). His eight remaining appointments included a bill for finding arms (16 Apr.), which concerned him as a deputy lieutenant.
Following the end of Beale’s mayoralty, Barnham resumed his representation of Maidstone. In 1626 he was again named to the committee for privileges (9 Feb.), and was appointed to five others, including two concerned with the militia (14 and 28 Mar.) and one to frame a Remonstrance against the continued levy of Tunnage and Poundage (7 June).
Barnham sat for Maidstone for a fourth time in 1628, but was not named to the privileges committee and played little recorded part in the Parliament’s business. On 21 Mar. he was appointed to attend the fast conference, and three days later was again named to a committee concerned with finding arms.
Following the death in 1630 of his wife’s nephew, Richard, Lord Dacre, Barnham secured the wardship of Dacre’s son.
