James Johnston Clark1 
He held the office of High Sheriff of County Derry in 1849.1 He held the office of Justice of the Peace (J.P.) for County Derry.1 He held the office of Deputy Lieutenant (D.L.) of County Derry.1 He held the office of Member of Parliament (M.P.) for County Derry.1 He lived at Largantogher House, County Londonderry, IrelandG.1
Children of James Johnston Clark and Frances Hall
- Elizabeth Hall Clark2
- Margaret Johnston Clark2
- Fanny Florence Emily Clark2
- Rebecca Edith Lucinda Clark2
- Alexander Jackson Clark2 b. 8 Jan 1840, d. 10 Feb 1863
- Lt.-Col. James Jackson Clark+2 b. 6 Apr 1845, d. 29 Oct 1926
- John Clark-Hall2 b. 17 Dec 1846, d. 13 Apr 1902
- Sir William Ovens Clark2 b. 14 Jan 1849, d. 3 Apr 1937
Rebecca Lucinda Clark1
From 9 April 1834, her married name became Stevenson.
John Stevenson1
He lived at Fort William, County Antrim, IrelandG.1 He held the office of Justice of the Peace (J.P.)1 He held the office of Deputy Lieutenant (D.L.)1 He had two daughters.1
- [S47] BIFR1976 page 237. See link for full details for this source. Hereinafter cited as. [S47]
Elizabeth Clark1 
Frances Hall1
From 28 April 1837, her married name became Clark.
Children of Frances Hall and James Johnston Clark
- Elizabeth Hall Clark2
- Margaret Johnston Clark2
- Fanny Florence Emily Clark2
- Rebecca Edith Lucinda Clark2
- Alexander Jackson Clark2 b. 8 Jan 1840, d. 10 Feb 1863
- Lt.-Col. James Jackson Clark+2 b. 6 Apr 1845, d. 29 Oct 1926
- John Clark-Hall2 b. 17 Dec 1846, d. 13 Apr 1902
- Sir William Ovens Clark2 b. 14 Jan 1849, d. 3 Apr 1937
Alexander Jackson Clark1 
He was Officer in the Army.1
Lt.-Col. James Jackson Clark1 
He held the office of High Sheriff of County Derry in 1875.1 He gained the rank of Lieutenant-Colonel in the 9th Brigade North Irish Division, Royal Artillery.1 He held the office of Deputy Lieutenant (D.L.) of County Derry.2 He held the office of Justice of the Peace (J.P.) for County Derry.1 He lived at Largantogher, County Londonderry, IrelandG.1
Children of Lt.-Col. James Jackson Clark and Mary Elizabeth Lenox-Conyngham
- Elleanor Laura Clark2
- Captain James Lenox-Conyngham Chichester-Clark+2 b. 26 Sep 1884, d. 31 Jan 1933
- Reverend Francis Hartley Hall Clark2 b. 2 Jun 1886, d. 7 Jun 1953
- Commander Roland Arbuthnot Clark+2 b. 15 Jun 1888, d. 1 Feb 1926
John Clark-Hall1 
His name was legally changed to John Clark-Hall on the death of his uncle, Alexander.2 He was given the name of John Clark at birth.2 He was Registrar-General of Shipping and Seamen.1
Mary Boyd1 
Her married name became Keown.1
Child of Mary Boyd and Richard Keown
- Lt.-Col. Henry Keown+1 b. 17 Mar 1817, d. 13 Jan 1872
- [S8885] Colin Perry, “re: Fenwick Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 26 Dec 2019. Hereinafter cited as “re: Fenwick Family.”