Latimer, William Thomas (1842–1919), presbyterian minister and historian, was the only child of John Latimer (d. 1843), presbyterian minister of First Ballynahatty, near Omagh, Co. Tyrone, and Eliza Latimer (née Dudgeon). His father died while William was still a baby. Latimer's delicate health, after pneumonia at the age of three, interfered with his education; after schooling at home and in the Grammar School, Omagh, he entered QCB but, after successfully completing one session, had to miss the three following, and studied on his own at home. He returned to college, and graduated BA in 1870. He studied for the ministry in Assembly's College, Belfast, was licensed by Belfast presbytery 22 May 1871, and was ordained 7 October 1872 in the congregation of Eglish, Co. Tyrone. He remained there as minister for thirty-eight years until 1 November 1911, when he had permission from the general assembly to retire; in 1887 he was moderator of the synod of Armagh and Monaghan.
Latimer's life was spent in historical research and writing; he was particularly interested in the history of presbyterianism and of individual congregations and in biography, but published over 200 articles on a wide range of subjects, in newspapers including the Northern Whig and the Witness, and in periodicals including UJA and the Irish Presbyterian. A lecture published as a pamphlet on the doctrines of the Plymouth Brethren (1882) went into eight printings, totalling 16,000 copies. A history of the Irish presbyterians had two editions (1893, 1902); a Popular history of the Irish presbyterian church was published in two editions in 1897, and a History of the life and times of the Rev. Henry Cooke had also two editions (1888, 1899). Latimer also wrote Ulster biographies, chiefly relating to the rebellion of 1798 (1897). He was noted for his large book collection, and was an enthusiastic founding member of the Presbyterian Historical Society. In 1910 his published work earned him the degree of MA from QUB, and in 1915 the combined faculties of the Presbyterian Church in Ireland awarded him a DD. W. T. Latimer died 19 July 1919, just after correcting proofs of an historical article, and was buried in Eglish churchyard.
Latimer married by special licence (8 July 1873) Frances Macbeth of Ballindrait, Strabane, Co. Tyrone, daughter of Andrew Macbeth, millowner. The Latimers had a daughter and a son; the latter, William John Latimer (1874–1947), became a presbyterian minister, and was called by his father's congregation in 1911, but remained in Carnone.