Thomas Pelham-Holles, 1st Duke of Newcastle, English politician, Prime Minister of Great Britain (died 1768)

Thomas Pelham-Holles, 1st Duke of Newcastle upon Tyne, 1st Duke of Newcastle-under-Lyne was an English Whig statesman who served as Prime Minister of Great Britain, and whose official life extended throughout the Whig supremacy of the 18th century. He is commonly known as the Duke of Newcastle.

The prime minister of the United Kingdom is the head of government of the United Kingdom. The prime minister advises the sovereign on the exercise of much of the royal prerogative, chairs the Cabinet, and selects its ministers. Modern prime ministers hold office by virtue of their ability to command the confidence of the House of Commons, so they are invariably members of Parliament.

July 21 is the 202nd day of the year in the Gregorian calendar; 163 days remain until the end of the year.