John Quicke (1724–1776) of Newton House in the parish of Newton St Cyres in Devon, was Sheriff of Devon in 1757.
According to Lauder (2002) he was the sixth John to have been head of the family. He was the eldest son and heir of the fifth John Quicke (died 1729) by his wife Rebecca Nutcombe (died 1733), a daughter and heiress of Richard Nutcombe of Nutcombe in the parish of Clayhanger, Devon, who also owned the adjoining manor of Ashbrittle in Somerset, inherited by marriage from the Doble family. His paternal grandmother (wife of Andrew Quicke (1666–1736) of Newton St Cyres) was Dorothy Northcote (died 1728), a daughter of Sir Arthur Northcote, 2nd Baronet of Hayne in the parish of Newton St Cyres, by his wife Elizabeth Godolphin, a daughter of Sir Francis Godolphin (1605–1667) and a sister of Sidney Godolphin, 1st Earl of Godolphin (1645–1712), First Lord of the Treasury. Elizabeth's nephew Francis Godolphin, 2nd Earl of Godolphin (1678–1766) married Henrietta Churchill, suo jure Duchess of Marlborough (1681–1733) the daughter of the great John Churchill, 1st Duke of Marlborough. This Northcote marriage gave the Quicke family a "strong connection" (Lauder, 2002) with the powerful Churchill family, until Henrietta's line died out. His younger brother was Rev. Nutcombe Quicke (1727/8-1809), Chancellor of Exeter Cathedral, who inherited his maternal estates and in 1792 assumed the surname Nutcombe (thus becoming Rev. Nutcombe Nutcombe), having married a daughter of George Lavington, Bishop of Exeter. The "fine memorial" of Rev. Nutcombe Nutcombe survives in Clayhanger Church.
It is said by the Quicke family that they had inherited their estate in Newton St Cyres on the marriage of Richard Quicke of Sandford to the heiress Elizabeth Bidwell, daughter of John Bidwell of Newton St Cyres (parents of Andrew Quicke (died 1557) of Newton St Cyres).
He served as Sheriff of Devon in 1757, becoming the first in his family to hold that prominent position and to serve in public life. It was an office subsequently held by his son, grandson and great-grandson, all named John. He built Newton House in about 1770, in the Georgian style.
In 1758 he married Jane Coster, a daughter of the wealthy Bristol merchant and mine-owner Thomas Coster (1684–1739), a Member of Parliament for Bristol, 1734-9. Jane was the widow of Robert Hoblyn (1710–1756) a wealthy tin miner of Nanswhyden (alias Nanswhyddon) in Cornwall, a Member of Parliament for Bristol 1742–54, whose mother was Penelope Godolphin, a daughter of Sidney Godolphin (1652–1732), Member of Parliament, a cousin of Sidney Godolphin, 1st Earl of Godolphin (1645–1712), Knight of the Garter, First Lord of the Treasury, thus related to the Quick family. Jane inherited from her father a large fortune of £40,000 and having had no children by her first husband the inheritance came to the Quickes. By his wife he had one son:
John Quicke was buried on 7 June 1776 at Newton St Cyres, in which church survives his mural monument, comprising coloured marbles and an urn. The inscription on the monument was transcribed by Rev. John Swete (died 1821), as follows:
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