[5] At the British Museum, Morton was initially a medical under-librarian in charge of manuscripts in the Cotton, Harley, Sloane, and Royal collections.
[19][Note 1] Charles Morton's second known marriage, to Lady Savile (born Mary Pratt), took place on 25 August 1767[20] at St George Bloomsbury in London across the street from the British Museum where he was employed.
Morton's marriage date is often misidentified as 1772[3] but the Records of the Lumleys of Lumley Castle[21] indicates Lady Savile was married to Captain Wallace in May 1744 and the marriage record at St George Bloomsbury identifies Mary Wallace as the Charles Morton's bride on 25 August 1767.
Charles Morton's third known marriage was to Elizabeth Pratt,[31] who is said to have been age 35 at the time, also took place at St George Bloomsbury, on 25 April 1791,[32] one month and two weeks after Lady Savile died.
This is evidenced both her wedding announcement in the Gentleman's Magazine,[33] and also by the summary of a letter now in the Nottinghamshire Archives, which states: "Note from Eliza Pratt sending Lady Savile's compliments to Mr. Hewett and that she will be much obliged to him if he invites Dr. Morton to dine at Grosvenor St. next Saturday.
Burke's Landed Gentry identifies Elizabeth Pratt as Charles Carr Morton's mother.
On 1 May 1799[36] Charles Carr Morton married Charlotte Tatlow[37] at Drumora Lodge in County Cavan, Ireland.
[38] On 30 August 1748, Morton presented his doctoral dissertation about the whooping cough entitled De Tussi Convulsiva[39] written entirely in Latin.
In March 1767, Morton was put in charge of the publishing the Domesday Book of 1086; a fact which caused resentment towards him from Abraham Farley, a deputy chamberlain of the Exchequer who for many years had controlled access to the Domesday Book in its then repository at the Chapter House, Westminster, and furthermore had been involved in the recent Parliament Rolls printing operation.
Morton produced two large publications during his tenure at the Museum, both related to the activities of Sir Bulstrode Whitelocke including his Journal of the Swedish Embassy[42] and Notes Upon the King's Writt.