"Portrait of William Pitt, 1st Earl of Chatham" by Jean André Rouquet at the Victoria and Albert Museum, London - More commonly known as William Pitt the Elder (to distinguish him from his son William Pitt the Younger), this was the British Secretary of State during the Seven Years War and many victories have been attributed to his policies. This is why, for instance, when the British took Fort Duquesne from the French, they renamed it Fort Pitt - now the city of Pittsburgh, Pennsylvania.
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1783-1784 British Portrait medallion of William Pitt the Younger at the Museum of London, London - From the curators' comments: "William Pitt the Younger became the youngest prime minister ever at the age of 24. He had only entered Parliament in 1781....Pitt remained in office continuously until 1801, a period which saw the French Revolution, the start of the Napoleonic Wars and the Act of Union between Britain and Ireland."
John Pitt, 2nd Earl of Chatham, by George Romney, scanned from 'House of Pitt' by Sir Tresham Lever (1947). This is the portrait on which Jacqui Reiter's excellent drawing is based (pinterest.com/...). It hangs, or used to hang, at Chevening, formerly the home of William Pitt's biographer Earl Stanhope.
"James Murray" by an unknown artist (1765-1770) at the National Portrait Gallery, London - Murray was the one of Wolfe's brigadier generals to stay behind as commander of the troops in Quebec after the city was successfully taken in 1759. After the conclusion of the Seven Years' War, he was appointed Governor of the newly British colony, but was recalled in 1766 (although he would nominally hold the post until 1768) due to conflicts with the new English-American merchants who settled there.
"Portrait of an Officer of the 15th Regiment of Dragoons" by Tilly Kettle (1768) at the National Army Museum, London - From the curators' comments: "The battle honour 'Emsdorf', seen on the front of this officer's helmet, was the first ever to be awarded to a British regiment....The battle honour was awarded for the regiment's part in the victory at the Battle of Emsdorf (1760) during the Seven Years War (1756-1763)."