Patrick O’Callaghan (1803/4–75)
Army surgeon. BA, Trinity College, Dublin, 1822; LL.B. & LL.D. 1864. Admitted comitatis causa to Oxford, 1865. Medical officer to the Eleventh Hussars, 1851. Retired, 1861. A founder of the Leamington Philosophical Society, 1866.
Sources
Alum. Dublin.
Alum. Oxon.
Census returns of England and Wales 1851 (The National Archives: Public Record Office HO107/1811/402/19), 1861 (RG 9/3211/72/2), 1871 (RG10/3195/54/4)
Dudley, T. B., From chaos to the charter: a complete history of Royal Leamington Spa from the earliest times to the charter of incorporation (Royal Leamington Spa, 1896–1900), p. 437
England & Wales, national probate calendar (index of wills and administrations), 1858–1966, 1973–95 (Ancestry.com, accessed 10 July 2019)
Mineka, Francis and Lindley, Dwight, eds., The later letters of John Stuart Mill 1849–1873 (Toronto: University of Toronto Press, 1972) 14: 553–4 (letter 308)