William Herbert, 2nd Marquess of Powis

William Herbert, 2nd Marquess of Powis DL ( – 22 October 1745) was an English peer and Jacobite supporter.

Early life Herbert was born in . He was the son of William Herbert, 1st Marquess of Powis, by Lady Elizabeth Somerset.

Until 1722 he was known as Viscount Montgomery. At the coronation of James II, 23 April 1685, he acted as page of honour. From 8 May 1687 until November 1688 he was colonel of a regiment of foot, and was also deputy-lieutenant of six Welsh counties from 26 February to 23 December 1688.

Career He served as Deputy Lieutenant of Anglesey in 1688. After the Glorious Revolution, efforts on behalf of James II resulted in Montgomery's committal to the Tower of London on 6 May 1689 and he was not given bail until 7 November. On 5 July 1690, and again on 23 March 1696 a proclamation, accompanied by a reward of £1,000, was issued for his apprehension; on the latter occasion, he was suspected of complicity in the Jacobite assassination plot. In May 1696 he was outlawed, but a technical error on the part of the sheriffs of London enabled him to retain his estate. He surrendered on 15 December 1696 and was taken to Newgate Prison. Though he was reported to have given information concerning the plot, he remained there until 19 June 1697, when during an outbreak of gaol fever he was released on bail.

Descendants Through his son Lord Edward, he was a grandfather of Barbara Herbert,