The death of Granville's parents and of his uncle the 1st Earl of Bath in 1701 placed Granville in a position of power which the accession of
Queen Anne in 1702 allowed him to employ. With the help of his cousin, John Granville, an influential Tory leader, he was elected
Member of Parliament for
Fowey at the
1702 English general election. When his elder brother, Sir Bevill Granville, was appointed
Governor of Barbados, Granville inherited his office as
constable of Pendennis Castle in 1703. In Parliament, he operated in the sphere of
Harley, who was an indifferent patron at first. He was absent from the division on the
Tack, becoming labelled a ‘Sneaker’. He was returned unopposed for Fowey at the
1705 English general election and with the help of Harley fended off an attempt to remove him from his post at Pendennis Castle. His aspiration to obtain a post led him to support the Court in voting for the Court candidate as Speaker on 25 October 1705, and he again supported the Court on the ‘place clause’ of the regency bill in February 1706. At the
1708 general election, he was returned again for Fowey. The height of his fame during the
Godolphin-
Marlborough administration came from his spirited defence of
Henry Sacheverell in 1710. After the fall of the Godolphin government, Granville became MP for
Cornwall at the
1710 British general election, and on 28 September 1710 he was made Secretary at War. In this capacity, he oversaw the passage of important bills on munitions and recruitment. However, his experience in the Tory government was marked by family and legal strife. He was the
heir male to the senior line of the Granville family following the death without progeny in 1711 of his cousin
William Granville, 3rd Earl of Bath. He was not in succession to the earldom and was in recognition raised to the peerage on 1 January 1712 as
Baron Lansdown of Bideford in the
Peerage of Great Britain and vacated his seat in the House of Commons. He was one of
Harley's Dozen created at once to change the political balance in the
Whig-dominated Lords. He expended time and money in an ultimately futile effort to secure the title of
Earl of Bath. Despite some success, his tenure in the War Office was marred by accusations of corruption and expensive contested elections. He was made a Privy Counsellor in 1712. In 1714 Queen Anne was succeeded by the
Hanoverian King
George I, who favoured the Whigs. Almost all the Tories who held office under Anne were dismissed, including Lord Lansdown. Embittered, he began a secret correspondence with the Jacobite
Old Pretender "James III". On 6 October 1721 James, who refused to recognise his peerage "Baron Lansdown" bestowed by Queen Anne, created him "Lord of Lansdown"," Viscount [ ]" and "Earl of Bath" in the
Jacobite Peerage of England, with remainder to his heirs male. On 3 November 1721 James created him "Duke of Albemarle", "Marquis Monck and Fitzhemmon", "Earl of Bath", "Viscount Bevel", and "Baron Lansdown of Bideford" in the
Jacobite Peerage of England, which supposed titles had no legal validity in the
Kingdom of Great Britain. One of these titles referred to his family's supposed descent (officially confirmed to the 1st Earl of Bath by warrant of King Charles II in 1661) from
Richard I de Grenville (d.post 1142) of
Neath Castle, one of the
Twelve Knights of Glamorgan and a brother and follower of
Robert FitzHamon the Norman conqueror of Glamorgan. The titles Monck and Albemarle referred to the fact that the 1st Earl of Bath had been granted reversion of his cousin Monck's Dukedom of Albemarle, should the Duke have died without male progeny. The title "Lansdown" referred to Lansdown Hill near Bath in Somerset where his grandfather Sir Bevil Grenville had met his heroic death at the
Battle of Lansdown in 1643. The titles created on 3 November 1721 were with remainder to the heirs male of his body, whom failing to his brother, Bernard Granville, and the heirs male of his body. ==Marriage==