On the death of the Duke of Grafton in May, 1757, which was occasioned by a fall from his horse, Lord Euston succeeded to his title, as well as to the large possessions attached to it.

This elevation brought with it, as usual, the smiles and favours of the Ministry on a young nobleman whose rank and wealth, and evidently no common parts, seemed to destine him for an important share in the government of the country. The Duke, however, at first appeared to shew a decided preference for a retired life. He was eagerly addicted to field sports: and took equal pride and pleasure in his pack of hounds, which made Wakefield the resort of the keenest hunters of the day. Newmarket, too, had unfortunately strong attractions for him. Above all, he had a home which had not yet lost its charms; for in January, 1736, he had married the Hon. Miss Liddel, only child of Lord Ravensworth, with the fairest prospects of happiness. The beauty, grace, and talents of the Duchess have been celebrated by contemporary writers, nor was she less entitled to praise for higher qualities. She had a warm heart and was susceptible of strong attachment.[220] The Duke was fully capable of appreciating her merits; and there is no reason to suppose that the first years of their union were clouded by any serious differences.

Memoirs of the Reign of King George the Third, Volume IV (of 4) — Part 139

In 1761, the Duke made a tour with the Duchess and his two elder children on the Continent; and it was only on his return in the following year, that he seems to have entertained serious thoughts of taking a more active part in politics.

Memoirs of the Reign of King George the Third, Volume IV (of 4) — Part 139

But to return to Mr. Grenville’s Ministry, which had been supported by great majorities (except on the debate on General Warrants) in both Houses, we can but remark that the vexatious and impolitic acts that were passed in the year 1764, and at the beginning of 1765, under these mighty majorities, were rapidly working out the greatest distresses and losses to the country.

Memoirs of the Reign of King George the Third, Volume IV (of 4) — Part 139

The Administration met the Parliament in 1765, with great confidence in their own strength, and too little attention to those steps by which they had ascended to their power. The illness of the King during the session awakened the duty of Parliament to bring forward a Regency Bill, which was early suggested by the King himself. The Bill was accordingly brought into the House of Peers, and there passed, though so drawn as to exclude the Princess-Mother from being nominated Regent. In the Commons, this affront was taken off by the insertion of her Royal Highness’s name, and by the amendment carried up, and agreed to by the Lords; when the Ministers had the mortification of being obliged to submit to bear that affront which they had destined for others.