Mervyn Herbert, 17th Baron Darcy de Knayth, styled Viscount Clive (7 May 1904 – March 1943) was a British peer and soldier.
Styled the Hon. Mervyn Herbert from birth, he was the second son of George Herbert, 4th Earl of Powis and his wife Violet, suo jure 16th Baroness Darcy de Knayth. His elder brother Percy, twelve years his senior, was killed fighting in the Battle of the Somme in 1916, at which point Mervyn became heir to his father's title Earl of Powis and took the courtesy title Viscount Clive.
Mervyn would follow in his brother's footsteps by fighting for Britain, gaining the rank of Squadron Leader in the Royal Air Force Volunteer Reserve. In 1929, at the death of his mother, he inherited the title of Baron Darcy de Knayth, making him a peer in his own right (while retaining the higher title of Viscount Clive by courtesy). In 1934 he married Vida Cuthbert, by whom he had one daughter.
He died in 1943 on active service. His barony passed to his four-year-old daughter Davina. His father was left without male heirs so on his death his earldom passed to a distant cousin.
| Peerage of England | ||
|---|---|---|
| Preceded by Violet Herbert |
Baron Darcy de Knayth 1929–1943 |
Succeeded by Davina Ingrams |