Bayntun-Rolt married firstly Lady
Mary Alicia Coventry (1754–84), daughter of
George Coventry, 6th Earl of Coventry, by special license at the Earl of Coventry's house at 148
Piccadilly, London, on 28 June 1777, with a daughter: • Maria Barbara Bayntun-Rolt (1780-1870), who married Rev. Dr John Starky (1770-1834), DD on 9 August 1797 at St James, Piccadilly, London His wife became involved in an adulterous relationship with John Allen Cooper and the couple were divorced on 24 June 1783. Bayntun-Rolt married secondly
Anna Maria Maud (1754-1827) on 18 May 1787 at
St Botolph's, Aldersgate, the daughter of John Maud (1714–82) and his wife Elizabeth Primatt (1725-), with no known issue. This marriage also foundered. Bayntun-Rolt had numerous illegitimate children in Spye Park and
Bromham, Wiltshire by his partner,
Harriet Maria Poynter (1764-1839). Several of these children did not reach maturity, including: • Lucy Bayntun (1791-) • Ann Bayntun (1792-) • Harriet Bayntun (1793-) • Edward Bayntun (1795-) • Mary Bayntun (1796-) • Andrew Bayntun (1797-) • Edward Thomas Bayntun (1798-) • John Bayntun (1799-) • Sally Rosalie Bayntun (1801-) • Elizabeth Bayntun (1802-) • John Charles Bayntun (1805–30) • Henry Bayntun (1807-) • Maria Constantia Bayntun (1808-) Bayntun-Rolt had a further 6 illegitimate children in
Corsham, and the
Bathampton,
Batheaston,
Swainswick and
Larkhall areas of
Bath, Somerset by his partner,
Anne Power (ABT 1781-1844), of Lambridge, Bath. Most of these children did reach maturity, including: • Wilmot Robert Bayntun Power (1801–89) • Charles Bayntun Power (1802–42) • Martha Bayntun Power (1804–81) • Anne Bayntun Power (1808–54) • Francis Bayntun Power (1809–78) • George Bayntun Power (1810–88) Bayntun-Rolt died on 12 August 1816. Although his will acknowledged and made provision for his surviving illegitimate children, he had no surviving legitimate male issue and so his title became extinct.
Spye Park and the remainder of his personal estate went to his only surviving legitimate child, Maria Barbara. A memorial exists on the south wall of
St Nicholas' Church, Bromham,
Wiltshire, close by his family estate of Spye Park. After Bayntun-Rolt's death, Harriet Maria Poynter married Aristeus Lovel on 4 September 1820 at
Wyke Regis,
Dorset, with no further issue. Anne Power married Robert Gomery (1778-1853) on 17 October 1822 at
Walcot, Bath,
Somerset with no further issue. The
Spye Park estate was sold in 1864 to pay the gambling debts of John Bayntun Starky (1834–72), a grandson of Maria Barbara Bayntun Starky, during her lifetime, and thus passed out of the family. Wilmot Robert Bayntun Power (1801–89) was the grandfather of Charles Edwin George Bayntun (1873-1940), known as
George Bayntun, who founded the Bath-based bookbinding business. ==Ancestors==