The Hon. Seton Montolieu Montgomerie (15 May 1846 – 26 November 1883) was the second son of Archibald Montgomerie, 13th Earl of Eglinton (1812–1861).
He was born at the Clarendon Hotel, London. Seton may have been so named following his father being created Earl of Winton, a title previously held by the Seton family. His mother, Theresa Newcomen, born in Calcutta,[1] was an illegitimate daughter of Thomas Gleadowe-Newcomen, 2nd Viscount Newcomen.[2] Lady Theresa died in December 1853 and Seton's father remarried in 1858, his new wife being Lady Adela Caroline Harriet Capell (1828–1860), daughter of Arthur Capell, 6th Earl of Essex. Seton had two half-sisters through this marriage:
Seton's older sister, Lady Egida Montgomerie (died 13 January 1880), married Frederick William Brook Thellusson, 5th Baron Rendlesham. His older brother was Archibald Montgomerie, who became the 14th Earl of Eglinton (3 December 1841 – 30 August 1892).
Seton had the rank of Lieutenant in the service of the Scots Fusilier Guards and married Nina Janet Bronwen Peers Williams, daughter of Lt.-Col. Thomas Peers Williams, on 11 June 1870.
Seton died in Windsor,[3] aged 37, from the effects of diabetes.[4] He would have inherited the title Earl of Eglinton if he had not died so young, and having only daughters who at the time were unable to inherit the property and title, his younger brother George (1848–1919) became the 15th Earl and George's son Archibald became the 16th Earl of Eglinton and Winton.
Seton and Bronwen had three children:[5]
His daughter Viva wrote two books; the first, published in 1914, was 'Sunny Days on the Riviera. Being a Diary of Some Sketching at Eze', illustrated with views of the Riviera by her sister Alswen. The second book was 'My Scrapbook of Memories', published in 1955 and containing references to Seton Montolieu Montgomerie, her mother and many Montgomerie family members.