By the late sixteenth century the Fanshawes were already established as a clan of almost hereditary office-holders.
Fanshawe was elected to the first Jacobean Parliament for the borough of Lancaster, a safe Duchy seat. His committees in the opening session of 1604 included those for bills to regulate watermen (9 May), relieve parishes infected with the plague (18 May), reform abuses of informers (1 June) and defray the charges of the Household (18 June).
In the second session Fanshawe claimed privilege after receiving a subpoena from Chancery (11 Feb. 1606).
Between May and August 1611 Fanshawe toured the Duchy’s landholdings in the north, and in the autumn continued into the Midlands. He lodged at Lancaster for almost a week, although he was also entertained by several local gentlemen, including Sir Richard Molyneux I* and Sir Richard Houghton*. Fanshawe eventually overspent his budget of £200 by £23 13s., but as he later claimed to have raised £12,000 the additional outlay was evidently worthwhile.
Until this point Fanshawe had closely followed an official brief, but as the Commons turned its attention to religion he began to express a more personal interest in debates, having inherited strongly Calvinist beliefs from his father. On 20 Apr. he drew the House’s attention to the flouting of the recusancy laws, and alluded to ‘great men’s letters’, a reference, perhaps, to the crypto-Catholic earl of Northampton, who until recently had dominated the Privy Council. He moved for ‘some consultation for the safety of the king’s person, by reason of the increase of recusants’ because in King’s Bench those accused of recusancy ‘openly allege they may not be indicted, for they have the Council’s letters’ or ‘letters patent by dispensation’.
On 14 May Fanshawe was appointed to consider a bill to transfer inquisition records from the petty bag office to the Court of Wards (14 May).
Fanshawe was relegated to Lancaster’s junior seat at the general election in December 1620, when the new chancellor of the Duchy, (Sir) Humphrey May*, took first place. Procedural matters were his main concern from the start. On 8 Feb. he declared that the judges had taken inadequate steps to curtail the disorderly conduct of Members’ pages, and two days later he called for the punishment of Sir John Leedes*, who had taken his seat without being sworn, ‘as one that hath come into the House not being chosen’.
On 8 Feb. Fanshawe moved for the committal of a bill ‘against certain troublesome persons, commonly called relators, informers, and promoters’.
On the eve of the 1624 general election Fanshawe was sworn in as surveyor-general to the duchy of Cornwall, with a seat on Prince Charles’ Council.
After the prorogation Fanshawe travelled down to Dorset to prepare the enclosure and partition of Gillingham forest, assuring the tenants in a speech at the town hall that ‘he came not to do any man wrong or like a moth to eat up any man’s estate’.
Re-elected for Lancaster to the first Caroline Parliament, Fanshawe again defended his own office. When it was alleged that writs of certiorari discouraged the conviction of recusants by increasing the cost of prosecution he assured the grand committee for religion that they were ‘very sparingly granted out of the King’s Bench’, though ‘some have come of late out of Chancery under the great seal’ (23 June 1625).
In the second Caroline Parliament Fanshawe resumed his seat at Lancaster, and through his longstanding Duchy connections arranged for his nephew (Sir) Thomas II to sit for Preston. The latter had recently been knighted, and consequently it is sometimes difficult to distinguish between him and Fanshawe in the parliamentary sources. One of the first matters to gain Fanshawe’s attention was the election of the Scottish courtier George Kirke for Clitheroe, which borough had been represented by Fanshawe’s brother, William, since 1621. On 18 Feb. Fanshawe objected that Kirke was an unnaturalized alien, and successfully moved for a new writ.
Fanshawe spent the summer of 1627 on a tour of Yorkshire ‘about His Majesty’s service’ reviewing the copyholds on various Crown lands.
As steward of the Crown manor of Barking Abbey since 1612, Fanshawe had been responsible for maintaining a substantial estate adjoining his own property in Essex, and had carried out expensive repairs to Dagenham bridge in 1620 and to the highway from Ilford to Blackwall in 1626.
