Which British prime minister oversaw the abolition of the slave trade in 1807?

William Grenville oversaw the abolition of the British slave trade in 1807. As prime minister from 1806 to 1807, he led the government known as the Ministry of All the Talents and helped guide the abolition bill through the House of Lords.

The Slave Trade Act received royal assent on 25 March 1807 and took effect on 1 May. It prohibited British subjects from participating in the Atlantic slave trade, although it did not immediately abolish slavery itself. Slavery continued in much of the British Empire until the Slavery Abolition Act of 1833, which began taking effect in 1834.

William Wilberforce was the best-known campaigner in the House of Commons, where the bill passed by 283 votes to 16. Grenville’s role is sometimes overlooked because public memory focuses on Wilberforce, Thomas Clarkson, and other abolitionists. Charles James Fox had also supported abolition, but he died in 1806 before the final victory.

The 1807 law was therefore a major legal milestone, not the complete end of British involvement in slavery. The Royal Navy later helped suppress illegal slave trading, while emancipation required another major parliamentary campaign decades later.