Herbert was born at the family seat Llanarth Court, Llanarth in Monmouthshire, the eldest son of John Arthur Edward Herbert, formerly Arthur Jones, of Llanarth. In 1846 Ivor's father married Augusta Hall, the only surviving child and heir of Benjamin Hall, 1st Baron Llanover. The marriage took place on 12 November 1846 and two years later, the father and his brothers assumed the name of Herbert by royal licence as the senior branch of the Herbert family.. His mother was the Honourable Augusta Charlotte Elizabeth Hall, the only surviving daughter and sole heiress of Benjamin Hall, 1st Baron Llanover and his wife Augusta Waddington, better known as the Welsh cultural nationalist Lady Llanover, heiress of the considerable Llanover estate in Monmouthshire. He had two younger brothers, Edward Bleiddyn and Arthur.
Military career
Herbert was a British army officer, serving in the Grenadier Guards. He served as General Officer Commanding the Militia of Canada from 1890 to 1895. In 1896, he was Colonel in the Grenadier Guards. He served in the Second Boer War in South Africa, where he was responsible for foreign representatives in the country.
Political career
Herbert was Member of Parliament for South Monmouthshire from 1906 until 1917. In 1907 he was created a Baronet, of Llanarth and Treowen in the county of Monmouth. On 20 June 1917 he was further honoured when he was raised to the peerage as Baron Treowen, of Treowen and Llanarth in the County of Monmouth. As a Catholic, he made efforts to remove Cromwell's Statue from Westminster.
Family
Lord Treowen was married on 31 July 1873 in London to the Honourable Albertina Agnes Mary Denison, youngest daughter of the Albert Denison, 1st Baron Londesborough and his second and younger daughter by his second wife, the former Ursula Bridgeman. Lady Treowen founded and was the first President of the Ottawa Decorative Art Society. She was President of the Woman's Humane Society, and the first President of the Humane Society of Ottawa, and, had cabmen's shelters erected in Ottawa. As a member of the Band of Mercy Union, in 1892, she championed a resolution protesting against the use of the check-rein, and agreeing not to use or hire horses that were check-reined. She urged the erection of a national monument to Laura Secord. She was the honorary Secretary to an organization that raised a fund by the women of Canada to present a wedding gift to the Prince and Princess of Wales. Lord and Lady Treowen had two children.
Hon. Fflorens Mary Ursula Herbert ; m. 20 April 1911 Walter Francis Roch, then MP for Pembrokeshire from 1908 to 1918, whose political career ended when he continued to support Asquith. He was also a barrister at the Middle Temple from 1913. In 1934, Roch was appointed JP for Monmouthshire. Issue, if any, unknown.
The estate Llanarth, near Llanover is still owned privately. According to the estate's site, the estates are all near Abergavenny. Both Llanarth and Llanover are privately owned estate villages within a conservation area. For maps, see The baronetcy and barony became extinct on Lord Treowen's death.
Commander of the Order of the Crown of Italy - 1901 - in recognition of his services when in charge of Italian and other foreign representatives in South Africa
Officer of the French Legion d'Honneur - 1902 - in recognition of his services when in charge of the foreign representatives attached to the British Army in South Africa
