in Mayfair. After the death in 1734 of his widow Lady Elizabeth Cavendish, who had re-married to Ralph Montagu, 1st Duke of Montagu (1638 – c. 1709), much of Potheridge House was demolished. Granville The ancient Grenville family (later modernised to Granville), lords of the manors of Bideford in Devon and Stowe in Cornwall, was earliest related to the Monk family through Honor Grenville (c. 1493/5-1566), wife of Arthur Plantagenet, 1st Viscount Lisle (died 1542), KG, and mother of Frances Plantagenet, wife of Thomas Monk of Potheridge. Thomas's great-grandsons renewed the kinship to the Grenvilles through their mother Elizabeth Smith, half-sister of Grace Smith, the wife of Sir Bevil Grenville. The 1st Earl of Bath fixed the spelling of the family name to "Granville". John Grenville, 1st Earl of Bath (1628–1701) on whom was settled a considerable part of the Monck estates by his childless cousin Christopher Monck, 2nd Duke of Albemarle (1653–1688). John Granville, 1st Baron Granville of Potheridge (1665–1707) (2nd son). In 1703 he was elevated to the peerage as "Baron Granville of Potheridge". He died without issue. William Granville, 3rd Earl of Bath (1692–1711) (nephew), following whose death in 1711 aged 19 the male line of the Granville family of Stowe became extinct. The estate of Potheridge fell to the inheritance of the descendants of his aunt Jane Granville (died 1696), a daughter of the 1st Earl of Bath and wife of Sir William Leveson-Gower, 4th Baronet (c. 1647 – 1691). Leveson-Gower The Leveson-Gower family, having inherited Potheridge, quickly sold it to the Rolle family of Stevenstone, great landowners in Devon. They did not however forget their Granville inheritance, and memorialised it in subsequent names and titles: Jane Granville's great-grandson was Granville Leveson-Gower, 1st Marquess of Stafford (1721–1803) one of whose younger sons was Granville Leveson-Gower, 1st Earl Granville (1773–1846) (younger half-brother of George Leveson-Gower, 1st Duke of Sutherland (1758–1833)), whose son was Granville Leveson-Gower, 2nd Earl Granville (1815–1891), Secretary of State for Foreign Affairs. Rolle Potheridge was acquired from the Leveson-Gower family by the Rolle family of nearby Stevenstone and of Bicton in South Devon. In 1850 it was held by the trustees of John Rolle, 1st Baron Rolle (c. 1750 – 1842) for the benefit of his adoptive heir Hon. Mark Rolle (1835–1907) (born Mark George Kerr Trefusis), a younger son of Charles Rodolph Trefusis, 19th Baron Clinton (1791–1866) of Heanton Satchville, Huish, the parish