Christopher Johnston was bapt. 28th October, 1750, at Moffatt; d. 6th March 1819, in Baltimore, Maryland, and is buried under Westminster Church on Fayette Street; his maternal uncle, Robert Swan, had for a number of years resided at Annapolis, as a partner
of the house of Nelson, Carlyle and Company, of Glasgow; d. unmarried; he left bequests to his nephews, John Swan and Christopher Johnston, who came to Maryland in 1766, and aided by their uncle's executors,readily found advantageous places in local counting rooms; in 1774, Christopher Johnston was a member of the Baltimore Independent Cadets, Capt. Mordecai Gist, and in 1781,
being then a member of the Baltimore Light Dragoons, Capt. Nicholas Ruxton Moore, he took part in the Yorktown Campaign; in 1795 he was one of the incorporators of the Bank of Baltimore, and in 1802 he was a member of the Second Branch of the Baltimore City Council, his brother-in-law-Thorowgood Smith being Mayor; he was ruling Elder of the First Presbyterian Church from 1st April, 1804, until 1817; m. in 1779, Susanna Stith, b. 1759, in Northampton County, Virginia, and d. 31st March, 1838, at her residence, Eutaw and Fayette Streets, Baltimore, Maryland."