Wrenham was at least the third generation of his family to reside at Swanton Morley. A full pedigree has not been ascertained, although his father and paternal grandfather were also named John.
In February 1607 Wrenham’s father arranged to lease the Heneage manors of Blackborough, Wormegay and East Winch, Norfolk to Sir Edward Fisher, a London Skinner, for a term of 60 years.
Wrenham’s decision to seek a seat in the 1621 Parliament was almost certainly linked to his ongoing dispute with Fisher, who eventually introduced a bill to confirm his possession. This received a single reading in the Commons on 12 May, but was rejected following opposition from Sir William Ayloffe and others.
Although an obscure figure, Wrenham was a vociferous Member, making several speeches during the session which identified him with the Crown’s critics. On 6 Mar. he called for the investigation of Giles Mompesson’s* various patents to be extended to the legal advisors who had approved them, a motion which embarrassed several ministers.
At the start of the autumn sitting, when Sir Edward Sackville reminded the House of an order against Members granting immunity from arrest for money, Wrenham argued that any offenders should be given time to revoke such protections.
Wrenham was not returned to Parliament again, but his dispute with Fisher continued, with further decrees from lord keeper Williams in 1622 and 1623, and it resurfaced in two further parliamentary sessions. On 13 Apr. 1624 Fisher’s bill was revived in the Commons, receiving two readings and being sent to committee (19 Apr.), where it clearly received some scrutiny, as additional Members were added on two occasions; but it was never reported.
Apart from the ongoing dispute with Fisher, little is known of Wrenham’s activities subsequent to the 1621 Parliament. In February 1628 he was summoned before the lord mayor of London for his activities in taking recognizances of innholders and victuallers not to serve flesh during Lent.
