The Rivers family settled at Chafford Place, on the borders of Kent and Sussex, in the reign of Henry VIII. Rivers’ grandfather was the steward of Edward Stafford, 3rd duke of Buckingham, who lived at nearby Penshurst, while his father made a fortune in the City.
This exceptional combination of Court and corporation interest earned Rivers the Southwark senior seat in the first Jacobean Parliament. He received 13 committee appointments in the 1604 session but made only one recorded speech, on 20 Apr., when he unsuccessfully opposed the third reading of the bill for the better execution of justice forbidding arbitrators to accept rewards for their services.
In the second session Rivers was named to 11 committees but made no recorded speeches. Several of his appointments related to London, including measures to limit unrestricted building (24 Jan. 1606), regulate the trade in diary products (28 Jan.), repeal part of the Act for regulating the Thames watermen passed in the previous session (28 Jan.) and improve the supply of water (31 January).
On 30 Oct. 1606 Rivers, together with Sir Edmund Bowyer*, was ordered by Chancery to examine the parish accounts of St. Saviour’s Southwark as part of a continuing lawsuit between the select vestry and a group of local inhabitants. The following December the critics of the vestry tried to refer seven articles detailing further grievances to Rivers and Bowyer, but were blocked by the vestry.
In his will, proved in 1609, Robert Sackville, by now 2nd earl of Dorset, described Rivers as ‘my faithful and dear friend’, and made him, together with Lord William Howard, responsible for the foundation of Sackville College for the poor at East Grinstead.
In 1611 Rivers made over his rights in the fee-farm of East Grinstead to the 3rd earl of Dorset.
In 1619 Rivers, by now in poor health, resigned his position in the alienations office and received permission from the Court of Aldermen to perform his duties in Southwark by deputy.
In 1625 Gervase Markham’s agricultural treatise The Inrichment of the Weald of Kent was dedicated to Rivers by the publisher, whose dedicatory epistle praised Rivers’ ‘affection unto hospitality’ and ‘supportation of the poor’.
Re-elected at Lewes in 1626, Rivers was named to five committees, all for private bills. He was also appointed to the conference with the Lords of 7 Mar. on defence.
Rivers drafted his will on 3 Dec. 1627, naming Amherst and Sir Eubule Thelwall* overseers and complaining of ‘the weakness and infirmity of my body daily increasing, and old age creeping on, ... [and] dullness of wit with forgetfulness more than in times past’. He nevertheless stood for Lewes again in 1628, when he was opposed by Anthony Stapley*. The sheriff returned two indentures but on 3 Apr. the Commons ruled in favour of Stapley.
