Background
Trench was born in Castleton, County Kildare, Ireland the son of Richard Trench, 2nd Earl of Clancarty and Henrietta Margaret Staples.
Trench was born in Castleton, County Kildare, Ireland the son of Richard Trench, 2nd Earl of Clancarty and Henrietta Margaret Staples.
He was educated at Street John"s College, Cambridge.
They had six children. Richard Somerset Le Poer Trench, 4th Earl of Clancarty (13 January 1834 – 29 May 1891) married Lady Adeliza Georgiana Hervey
Major Honorary Frederick Le Poer Trench (10 February 1835 – 17 December 1913) married (1) Harriet Mary Trench (2) Catherine Simpson
Colonel William Le Poer Trench (17 June 1837 – 16 September 1920) married Harriet Maria Georgina Martins
Lady Anne Le Poer Trench (1839 – 12 March 1924) married Frederic Sydney Charles Trench
Power Henry Le Poer Trench (11 May 1841 – 30 April 1899)
Lady Sarah Emily Grace Le Poer Trench (6 December 1843 – 2 August 1875) married John Melville Hatchell.