Baptised on 25 September 1666, Salisbury was one of the ten children of James Cecil, 3rd Earl of SalisburyKG, by his marriage in 1661 to Lady Margaret Manners, a daughter of John Manners, 8th Earl of Rutland. He was educated at St John's College, Cambridge, and as his father's eldest surviving son succeeded him when he died in May 1683. In 1656 Thomas Russell purchased half of Witley Park in Surrey for Cecil's father-in-law and a half share therefore passed on marriage of each daughter, one of whom was Cecil's wife. On 13 July 1683, at the age of sixteen, the new Earl of Salisbury married Frances Bennett, a daughter of Simon Bennett, of Buckinghamshire. Bennett, who by the time of this marriage had died, had left three daughters, and in his will had left them each £20,000, subject to their not marrying before the age of sixteen or without the consent of those he named, with the proviso that the legacy of a daughter doing so was to be reduced to £10,000. Frances Bennett married Salisbury before she was sixteen, but with the consent of the Executors to the will, and this later led to litigation.
Career and imprisonment
Salisbury inherited from his father the position of Capital Steward of the borough of Hertford. After his marriage, he travelled abroad for some years, returning to England at about the beginning of 1688. That year, he was appointed a Gentleman of the Bedchamber to King James II and converted to Roman Catholicism, but his appointment was overtaken by the Glorious Revolution of October to December 1688, during which he served the king as Colonel of a regiment of horse. Salisbury was arrested in January 1688/89. On 26 October 1689 the House of Commonsimpeached him with the Earl of Peterborough for high treason on the grounds of "departing from their allegiance and being reconciled to the Church of Rome" and asked the House of Lords to commit them. On the same day the Lords ordered the two men to be brought to the bar of that House. Salisbury was already imprisoned in the Tower of London, and the Lords ordered that "his lady, friends and servants" were to have access to him. Brought to the House on 28 October, in reply to the charge Salisbury said: Salisbury remained in the Tower without trial. On 2 October 1690, the House of Lords read his petition, which stated "That he hath been a prisoner for a year and nine months, notwithstanding the late act of free and general pardon, and praying to be discharged." On 30 October, the Lords found that both Salisbury and Peterborough had been pardoned by "the king and queen's most gracious, general and free pardon" and resolved to discharge them both without hearing the views of the House of Commons on the matter. A decade later, parliament included a provision in the Act of Settlement 1701 stating plainly that "no pardon under the Great Seal of England be pleadable to an impeachment by the Commons in Parliament". After his release, Salisbury pursued a case in the High Court of Chancery concerning his wife's marriage portion under her father's will, as only £10,000 of a legacy of £20,000 had been paid. The dispute was about whether the amount should be reduced because Lady Salisbury had been under the age of sixteen when she married, a circumstance which the Executors to the will had agreed to. On 1 May 1691 the Court found in Salisbury's favour and ordered that he should receive a further £10,000, by way of a charge on his wife's sisters' estates. In March 1693/94, John Dryden dedicated his new play Love Triumphant to Salisbury. His intention was probably to make a gesture of defiance to the new government, of which Dryden disapproved.
