Admiral Charles Middleton, 1st Baron Barham, PC (14 October 1726 – 17 June 1813) was a Royal Navy officer and politician. As a junior officer he saw action during the Seven Years' War. Middleton was given command of a guardship at the Nore, a Royal Navy anchorage in the Thames Estuary, at the start of the American War of Independence, and was subsequently appointed Comptroller of the Navy. He went on to be First Naval Lord and then First Lord of the Admiralty.
William Wilberforce (24 August 1759 – 29 July 1833) was a British politician, philanthropist, and a leader of the movement to abolish the Atlantic slave trade. A native of Kingston upon Hull, Yorkshire, he began his political career in 1780, and became an independent Member of Parliament (MP) for Yorkshire (1784–1812). In 1785, he underwent a conversion experience and became an evangelical Anglican, which resulted in major changes to his lifestyle and a lifelong concern for reform.
In 1787, Wilberforce came into contact with Thomas Clarkson and a group of activists against the transatlantic slave trade, including Granville Sharp, Hannah More and Charles Middleton. They persuaded Wilberforce to take on the cause of abolition, and he became a leading English abolitionist. He headed the parliamentary campaign against the British slave trade for 20 years until the passage of the Slave Trade Act 1807.