John Wallop, 1st Earl of Portsmouth (15 April 1690 – 22 November 1762), of Hurstbourne Park, near Whitchurch and Farleigh Wallop, Hampshire, known as John Wallop, 1st Viscount Lymington from 1720 to 1743, was a British politician who sat in the House of Commons from 1715 to 1720, when he vacated his seat on being raised to the peerage as Viscount Lymington and Baron Wallop.
Wallop was the third son of John Wallop, of Farleigh Wallop and his wife Alicia, daughter of William Borlase. The Wallops were an old and influential Hampshire family; his great-grandfather was the regicide Robert Wallop. His father died about 1694, and he succeeded an elder brother, Bluett Wallop, in the family estates in 1707. Wallop was educated at Eton in 1708, in Geneva from 1708 to 1709, and took his Grand Tour through Italy and Germany in 1710. 
In 1715, Wallop was returned as a Whig Member of Parliament for both Andover, where a family interest existed, and Hampshire, choosing to sit for the latter. In 1717, he took the side of Stanhope and Sunderland over Walpole and Townshend and was rewarded with appointment as a junior Lord of the Treasury. He was re-elected without opposition at the ensuing by-election in Hampshire. However, he voted against the Government on the repeal of the Occasional Conformity and Schism Acts. 
When Sunderland fell in 1720 after the South Sea Bubble, Wallop was put out of the Treasury. He was compensated with a peerage, being created Viscount Lymington and Baron Wallop on 11 June 1720. In 1731, he suggested to Queen Caroline (through the medium of her favorite, Charlotte Clayton) that he should replace the Duke of Bolton as the Government's electoral manager in Hampshire, but nothing immediately came of this. 
On 11 January 1732 (O.S.) he was appointed Justice in Eyre for the forests north of Trent. In 1733, when the Duke of Bolton broke with Walpole over the proposed Excise Bill, he was stripped of most of his offices; Lymington succeeded him as Lord Lieutenant of Hampshire, Vice-Admiral of Hampshire, and Vice-Admiral of the Isle of Wight. In July 1734, the Duke of Montagu, who had succeeded Bolton as Governor of the Isle of Wight, resigned that office and Lymington received it as well, although he resigned office as Justice in Eyre that year.  The disaffection of Bolton threatened the Whig interest in Hampshire. Lymington worked in "perfect harmony" with Lord Harry Powlett, Bolton's brother and one of the Whig candidates, but Bolton's opposition to Anthony Chute, the other Whig, resulted in the defeat of Chute and the victory of one of the Tory candidates, Edward Lisle. 
Upon Walpole's fall in 1742 (due in part to the failed siege of Cartagena, which had claimed the life of Lymington's second son), the Duke of Bolton regained all of his prior offices in Hampshire and the Isle of Wight, to Lymington's loss. As in 1720, Lymington was compensated with a peerage, and was created Earl of Portsmouth on 11 October 1743. He regained the offices of Governor and Vice-Admiral of the Isle of Wight in 1746, when Bolton supported the abortive ministry of Bath and Granville and was deprived of those posts by the Pelhams. 
On 20 May 1716, Wallop had married Lady Bridget Bennet (d. 12 October 1738), the daughter of Charles Bennet, 1st Earl of Tankerville. They had six sons and four daughters:  
Lymington remarried on 9 June 1741 to Elizabeth, widow of Henry Grey and daughter of James Griffin, 2nd Baron Griffin of Braybrooke; they had no children. 
Two of his sons died in 1749: Bluett, his youngest, in June, and John, Viscount Lymington in November. Upon his death in 1762, Wallop was succeeded by his grandson John Wallop, 2nd Earl of Portsmouth.
Earl of Portsmouth is a title in the Peerage of Great Britain. It was created in 1743 for John Wallop, 1st Viscount Lymington, who had previously represented Hampshire in the House of Commons. He had already been created Baron Wallop, of Farleigh Wallop in Hampshire in the County of Southampton, and Viscount Lymington, in 1720, also in the Peerage of Great Britain.
This is a list of people who have served as Lord Lieutenant of Hampshire. Since 1688, all the Lords Lieutenant have also been Custos Rotulorum of Hampshire. From 1889 until 1959, the administrative county was named the County of Southampton.
Robert Montagu, 3rd Duke of Manchester was a British politician who sat in the House of Commons from 1734 until 1739 when he succeeded to the peerage as Duke of Manchester.
Charles Powlett, 3rd Duke of Bolton, styled Earl of Wiltshire from 1685 until 1699, and Marquess of Winchester from 1699 until 1722, was a British landowner and Whig politician who sat in the English House of Commons from 1705 to 1708 and in the British House of Commons between 1708 and 1717, when he was raised to the peerage as Lord Powlett and sat in the House of Lords.
Gerard Vernon Wallop, 9th Earl of Portsmouth, styled Viscount Lymington from 1925 until 1943, was a British landowner, writer on agricultural topics, and politician involved in right-wing groups.
Lord William Powlett was an English Member of Parliament.
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Newton Wallop, 6th Earl of Portsmouth JP, DL, styled Viscount Lymington until 1891, was a British Liberal politician but then joined the Liberal Unionist Party in 1886. He later switched back to the Liberal Party to serve as Under-Secretary of State for War under Sir Henry Campbell-Bannerman from 1905 to 1908.
John Conduitt, of Cranbury Park, Hampshire, was a British landowner and Whig politician. He sat in the House of Commons from 1721 to 1737. He was married to the half-niece of Sir Isaac Newton, whom Conduitt succeeded as Master of the Mint.
Sir John Wallop was an English soldier and diplomat.
John Wallop, Viscount Lymington was a British politician, styled Hon. John Wallop from 1720 to 1743.
Henry Wallop was a British soldier and politician, the second son of John Wallop, Viscount Lymington.
John Charles Wallop, 3rd Earl of Portsmouth, styled Viscount Lymington until 1797, was a British nobleman and lunatic.
John Wallop, 2nd Earl of Portsmouth, styled Hon. John Wallop from 1743 to 1749 and Viscount Lymington from 1749 to 1762, was a British nobleman.
BluettWallop was a British soldier and politician.
Quentin Gerard Carew Wallop, 10th Earl of Portsmouth,, styled Viscount Lymington in 1984, is a British peer and current head of the Wallop family.
Isaac Newton Wallop, 5th Earl of Portsmouth DL JP(11 January 1825 – 4 October 1891) was a British Peer and the son of Newton Fellowes, 4th Earl of Portsmouth and Lady Catharine Fortescue.