William Grenville, 1st Baron Grenville
William Wyndham Grenville, 1st Baron Grenville (25 October 1759 – 12 January 1834) was a British Pittite Tory politician who was Prime Minister of the United Kingdom from 1806 to 1807, but was a supporter of the Whigs for the duration of the Napoleonic Wars. As prime minister, his most significant achievement was the abolition of the slave trade in 1807.
Source: Wikipedia — William Grenville, 1st Baron Grenville (CC BY-SA 4.0)