William Herbert, 1st Marquess of Powis

William Herbert, 1st Marquess of Powis, PC (1626 – 2 June 1696) was an English nobleman, best remembered for his suffering during the Popish Plot.

He succeeded his father, the 2nd Baron Powis, as 3rd Baron Powis in 1667, and was created Earl of Powis in 1674 by King Charles II and Viscount Montgomery, of the Town of Montgomery, and Marquess of Powis in 1687 by King James II, having been appointed to the Privy Council in 1686. He married in July 1654, Lady Elizabeth Somerset (c. 1633–1691), daughter of Edward Somerset, 2nd Marquess of Worcester (d. 1667), by whom he had six children, a son and heir and six daughters, one of whom, Winifred, married William Maxwell, 5th Earl of Nithsdale, who was condemned to death for high treason for participating in the Jacobite Rising of 1715. Lady Nithsdale famously organised her husband's escape from the Tower of London.

A cousin of the 1st Baron Herbert of Cherbury, Powis was, together with his wife, one of the leading Roman Catholics. He was one of the "Five Catholic Lords" falsely accused by Titus Oates in the Popish Plot of conspiring to kill the King and as a result spent six years in the Tower of London awaiting trial; his wife's desperate efforts to free him led her to fabricate the "Meal-tub Plot" for which she narrowly escaped being convicted for treason herself. Powis was finally freed in 1684. He remained faithful to the deposed King James after the Glorious Revolution of 1688. It was he who spirited away Queen Mary and the infant James, Prince of Wales, and took them into their French exile. As a reward, he was created "Duke of Powis" and "Marquess of Montgomery" in the Jacobite Peerage by King James.

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