[4] He was promoted unsuccessfully as a court favourite in 1618 by the Earl of Suffolk, but was knighted on 12 February 1623,[4] and was raised to the peerage of Ireland as Baron Monson of Ballingard, County Limerick and Viscount Monson, of Castlemaine, County Kerry, by letters patent dated 23 August 1628[5] On 13 August 1633 he became a member of Gray's Inn.
[12] On 19 July 1649 he tried to persuade the house into the belief that the sum of £4,500 was owing to him as arrears of the pension due to his late wife the Countess of Nottingham,[13] but he lost his motion by two votes.
The Rump Parliament, when restored in May 1659, was obliged, to form a quorum, to send for Monson and Henry Marten from the Fleet prison, where they were both confined for debt.
On 1 July 1661, he was brought up to the bar of the House of Commons, and, after being made to confess his crime, was degraded from all his honours and titles and deprived of his property.
[15] In petitioning the House of Lords on 25 July to remit what was most ignominious in his sentence, Monson declared that his design in sitting at the king's trial was, if possible, to prevent "that horrid murder".