Blackwood represented Killyleagh in the Irish House of Commons between 1799 and 1800. From 1813 to 1832 he was a Commissioner of Audit of Ireland. He succeeded his elder brother James in the barony in 1836. This was an Irish peerage and did not entitle him to an automatic seat in the House of Lords.
Family
Lord Dufferin and Claneboye married firstly on 19 June 1784, Mehetabel Hester Temple, second daughter and co-heir of Robert Temple, elder brother of Sir John Temple, Bt. and lineal descendant of the ancient family of Temple of Stowe, and had issue:
Robert Temple Blackwood, a captain in the 69th Foot and killed at the Battle of Waterloo
Hans Blackwood, who died unmarried
Price Blackwood, 4th Baron Dufferin and Claneboye
Henrietta Blackwood, who married in April 1807 William Stewart Hamilton, of Brown's Hall, County Donegal
He married secondly on 8 July 1801, Elizabeth Finlay, eldest daughter and co-heir of William Henry Finlay, of Gennetts, County Meath, and had by her, with five daughters, issue:
Reverend William Stear Blackwood, Vicar of Ballinderry, County Antrim, who married firstly on 24 March 1832, Elizabeth Hamilton, daughter of Robert Hamilton, of Clonsilla, County Dublin, and had issue:
*Hans Stevenson Blackwood, who married firstly in 1862 Jane West, youngest daughter of Admiral of the Fleet Sir John West GCB, and married secondly on 6 January 1892, Mary Emily Hunt, only daughter of Henry Hunt JP, of Hunningham, Warwickshire, and had one son, Henry Stear Blackwood, educated at Eton College and was a Captain in the 9th Battalion of the London Regiment and died from wounds received in action;
*Robert William Blackwood, a Lieutenant Colonel and former major in the 2nd Battalion of the Oxford Light Infantry and was married on 19 April 1879, to Mary Elizabeth Taylor, daughter of Simon Watson Taylor, of Erlestoke Park, Wiltshire, and had issue: William Stear Blackwood, Robert Montagu Blackwood, Lieutenant, Sherwood Foresters, District Commissioner in Nigeria 1905–1918, Captain commanding an RAF squadron 1918–1919 and married on 29 April 1925, Daisy Kelsey, daughter of Thomas Kitching Kelsey Hans Frederick Blackwood MC, Lieutenant Colonel, The Green Howards, served and wounded in the First World War and died unmarried; Elizabeth Mary Blackwood, who married on 21 April 1909, Marcus Leonard Theodore Hare, of Forest House, Chigwell Row, Essex and had issue;
*Price Frederick Blackwood, Major, Royal Artillery, JP for Berkshire and Northamptonshire, and married on 14 July 1880, Henrietta Cator, only child of Albemarle Bertie Cator, and had issue: Albemarle Price Blackwood DSO, served in South Africa 1900–1901 and in the First World War, appointed to the Order of the Star of Romania, later Lieutenant Colonel and Major, The Border Regiment, Brigadier General on the General Staff 1919, and married on 28 April 1920, Kyra, daughter of Albert Llewelyn Hughes and widow of Serge de Boursac, and had two daughters, Kyra Henrietta who was twice married and had issue, and Ursula Henrietta.
Henry Stevenson Blackwood, Captain, 17th Hussars and married on 25 April 1857, Lady Amelia Capel, sister of Arthur Algernon Capell, 6th Earl of Essex, and died without issue.
