, between 1670 and 1699 Throckmorton was born on 21 August 1702 and was baptised on 22 August 1702 at
Weston Underwood, Buckinghamshire. He was the third son of
Sir Robert Throckmorton, 3rd Baronet and Mary Yate (d. 1722). As the third son, Robert was not in position to inherit the baronetcy from his father at the time of his birth, however, his parents' eldest son, also named "Robert", lived for only two weeks. Two years after Robert died, his parents had a second son, named "George" and Robert was born 12 years after George who would have inherited the baronetcy, but died before their father did. Among his siblings were
Elizabeth Throckmorton (prioress of the Convent of Our Blessed Lady of Syon in Paris), Charlotte Throckmorton (wife of
Sir Thomas Hunloke, 3rd Baronet), Barbara Throckmorton (wife of Peter Giffard, 20th of
Chillington), Apollonia Throckmorton (wife of
Sir Edward Blount, 4th Baronet), Anne Throckmorton (wife of John Petre, a descendant of the
2nd Baron Petre), and Mary Throckmorton (wife of James Fermor). His paternal grandparents were son of
Sir Francis Throckmorton, 2nd Baronet and the former Anne Monson (a granddaughter of Admiral
Sir William Monson). His aunt,
Anne Throckmorton, was Abbess of the English
Augustinian Convent of
Notre Dame de Sion in
Paris. His maternal grandparents were
Sir Charles Yate, 3rd Baronet of
Buckland and the former Frances Gage (a daughter of
Sir Thomas Gage, 2nd Baronet of
Firle Place). ==Career==