Name, year of birth of “1798”, place of birth, from Sherilyn Oliver (nee North) great-granddaughter of Francis Oliver b.1840, youngest child of James and Ruth Oliver.

Entry found in July 2020 in 1851 England Census for Northcott Hamlet in Boyton Parish, County and Parliamentary division of Northern Division of Devon, for Northcott Villiage
William Walter, Head
Ann Walter, Wife [This Mary’s daughter]
Hariot, Daug
Amelia, Daug
Mary Oliver, House Servant Married, age 53, born Ashwater, Devon, England [circa 1798] [Husband John is listed in Boyton Mill entry]
Thirza Oliver, Visitor, Ag Labourer, daughter, Unmarr, age 16, born Pyworthy, Devon, England [circa 1835]
- - [NOTE: Thirza is the daughter of this Mary. Thirza died one year later age 17] - -
Maria Night, Servant
Elizabeth Reed, Servant
Salloman Markes, Servant
Samuel Marks, Servant

Katia, wife of Tim Grant Oliver, in an email dated 19 December 2022 confirms what nzolivers found above and writes, "It is interesting that John Oliver's (b. 1802) wife Mary Oliver was living with Ann Walter in 1851, as a house servant. Their daughter Thirza was a visitor”.
Tim Oliver is a x3 great grandson of James and Ruth Oliver, his grandfather being Ivor James Clark Oliver (1907-1989).

Maiden name, date and place of Marriage, from Devon Marriages and Banns records received from Katia, wife of Tim Grant Oliver, in the email dated 19 December 2022:
First name(s): Mary
Last name: Sleeman
Marriage year: 1824
Marriage date: 03 Aug 1824
Spouse's first name(s): John
Spouse's last name: Oliver
Place: Virginstow
Parish: Virginstow
Denomination: Anglican
County: Devon
Country: England

Interesting that husband John Oliver’s grandmother was a “Sleeman”, Hannah Sleeman.
Virginstow is 3 1/2 miles from St Giles on the Heath in Devonshire.

Details of burial from a link to an image in an email dated 20 January 2023 received from Katia, wife of Tim Grant Oliver:
Burials in the Parish of Boyton in the County of Cornwall in the Year 1880
Name: Mary Oliver
Abode: Boyton
When Buried: August 18 1880
Age: 81
By Whom the Ceremony was performed: Thomas Walters, Vicar [was Vicar 1870 to 1907]

Date and place of death, from Death Record received from the 'General Register Office (GRO) for England and Wales' in November 2023. Please see PDF for copy.
Name: Mary Oliver
When and Where Died: 16 August 1880, Town Boyton, Cornwall
Age: 81 Years
Rank or Profession: Widow of John Oliver, Miller
Cause of Death: Paralysis 37 days Certified by Wm Andrew UB CM, Launceston
Informant: Francis Oliver, Brother-in-law In attendance, Boyton Mill, Northcott Hamlet