Background
He was the second son of Colonel Hugh Bampfield (d1690), (eldest son and heir apparent of Sir Coplestone Bampfylde, 2nd Baronet (c 1633–1692) of Poltimore and North Molton, Devon, whom he predeceased) by his wife Mary Clifford, daughter of James Clifford of Ware. His elder brother was Sir Coplestone Bampfylde, 3rd Baronet (c 1689–1727) of Poltimore.
The Bampfield family had been seated at Poltimore since about 1300.