Gybbon was the son of Robert Gybbon of Hole Park, and his wife Elizabeth Phillips, daughter of John Phillips of St. Clement Danes. He travelled abroad in Holland and Germany and entered Middle Temple in 1694. He succeeded his father in 1719.
Gybbon entered Parliament in 1707 as Whig Member of Parliament for Rye, and represented the constituency until his death 55 years later, eventually becoming Father of the House of Commons from 1749. Early in his career he was appointed a Commissioner of Revenue in Ireland, and in the 1720s was Chairman of the Committee of Privileges and Elections. From 1726 to 1730, he was Surveyor-General of Land Revenues. For the next few years he was in opposition, supporting Pulteney against Robert Walpole's administration. On Walpole's fall in 1742, Gybbon was appointed a Lord of the Treasury in Wilmington's government, retaining the post after Henry Pelham replaced Wilmington in 1743 but losing office in the reshuffle after Carteret was sacked at the end of 1744.
He died in 1762, having married Catherine, the daughter of Honor Bier, with whom he had an only daughter. She left Hole Park to a Mrs Jefferson who was married to a John Beardsworth.
- "GYBBON, Phillips (1678-1762), of Hole Park, Rolvenden, Kent". History of Parliament Online (1690-1715). Retrieved 25 August 2018.
- "GYBBON, Phillips (1678-1762), of Hole Park, Rolvenden, Kent". History of Parliament Online (1715-1754). Retrieved 25 August 2018.
- Robert Beatson (1807). A chronological register of both houses of the British Parliament, from the union in 1708, to the third Parliament of the United Kingdom of Great Britain and Ireland, in 1807. printed for Longman, Hurst, Rees, and Orme [by J. Chalmers & Co.]
- Lewis Namier & John Brooke, The History of Parliament: The House of Commons 1754-1790, London: HMSO, 1964)
|Parliament of Great Britain|
| Member of Parliament for Rye
With: Edward Southwell 1707–1708
Admiral Sir John Norris 1708–1722
The Lord Aylmer 1722–1727
John Norris 1727–1733
Matthew Norris 1733–1734
Admiral Sir John Norris 1734–1749
Thomas Pelham 1749–1754
George Onslow 1754–1761
Captain John Bentinck 1761–1762
Captain John Bentinck
Sir Richard Shuttleworth
| Father of the House
Sir John Rushout, 4th Baronet
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