At the death in 1627 of their father, the combative Jacobean puritan John Frewen, the family real estate went to Accepted Frewen’s younger brother, Thankful.
Frewen’s advancement was aided by his link to the court through his brother, Thankful, purse bearer and secretary to the lord keeper, Sir Thomas Coventry† (later Baron Coventry), who had also been a patron of his father’s.
In July 1642, Frewen, along with fellow Oxford college heads John Prideaux†, bishop of Worcester, Christopher Potter and Samuel Fell, father of John Fell, later bishop of Oxford, was accused of attempting to assist the royalist war effort by helping to convey the university plate to the king at York. The Commons ordered his arrest; according to Frewen’s biographer, a £1,000 bounty was put on his head.
In September 1660 Frewen was nominated archbishop of York. There is no evidence in the proposals made in 1659 by Edward Hyde, the future earl of Clarendon, that Frewen was intended for ecclesiastical preferment, and the appointment was described as ‘strange’ by Thomas Smith, later bishop of Carlisle, but Frewen’s closeness to Gilbert Sheldon, the future archbishop of Canterbury (whom he referred to in his will as his ‘worthy friend’, leaving him with responsibility for overseeing his bequest to Magdalen College) perhaps explains the preferment.
According to Wood Frewen attended the Worcester House Conference in October 1660, though this has since been doubted.
Frewen took his seat in the House on 20 Nov. 1661. He attended the session for just over 50 per cent of the sittings and was named to nine committees, reporting from one (the Hull churches bill) on 11 December. He was present throughout the passage of the uniformity bill and on 24 Feb. 1662 was absent from the House, attending the Privy Council while the king approved the revised prayer book.
Frewen, who received a report from the York postmaster in April 1662 about ‘persons formerly known as enemies of the king and Church’, only arrived in his diocese in July 1662 to prepare for the Bartholomew’s day ejections.
In January 1664, during a quarrel between the cathedral clergy and the city governors over seating in York minster (precipitated by Frewen’s reorganizations) the archbishop fell dangerously ill.
Frewen never married. He was said to be so misogynistic that he would not even allow female servants in his household.
