Question: Olaudah Equiano known as Gustavus Vassa was a slave freed by Sons of Africa

full_context: Document 1: Sons of Africa: Sons of Africa was a late 18th-century British group that campaigned to end slavery. Its members were educated Africans in London, freed slaves who included Ottobah Cugoano, Olaudah Equiano and other leading members of London's black community. It was closely connected to the Society for the Abolition of the Slave Trade, a non-denominational group founded in 1787, whose members included Thomas Clarkson.
Document 2: The Interesting Narrative of the Life of Olaudah Equiano: The Interesting Narrative of the Life of Olaudah Equiano
Document 3: Frederick Douglass: Frederick Douglass (born Frederick Augustus Washington Bailey;  February 1818  – February 20, 1895) was an African-American social reformer, abolitionist, orator, writer, and statesman. After escaping from slavery in Maryland, he became a national leader of the abolitionist movement in Massachusetts and New York, gaining note for his dazzling oratory and incisive antislavery writings. In his time, he was described by abolitionists as a living counter-example to slaveholders' arguments that slaves lacked the intellectual capacity to function as independent American citizens. Northerners at the time found it hard to believe that such a great orator had once been a slave.
Document 4: The Dying Negro: The Dying Negro: A Poetical Epistle was a 1773 abolitionist poem published in England, by John Bicknell and Thomas Day. It has been called "the first significant piece of verse propaganda directed explicitly against the English slave systems". It was quoted in "The Interesting Narrative of the Life of Olaudah Equiano" of 1789.
Document 5: Equiano (crater): Equiano is a crater on Mercury. It has a diameter of kilometers. Its name was adopted by the International Astronomical Union in 1976. Equiano is named for the abolitionist writer Olaudah Equiano, who lived from 1750 to 1797.
Document 6: John Holman (slave trader): John Holman was an English slave trader from London who settled in the Pongo River area in the 1760s before eventually moving on to South Carolina in 1790.
Document 7: Blockade of Africa: The Blockade of Africa began in 1808 after Britain outlawed the Atlantic slave trade, making it illegal for British ships to transport slaves. The Royal Navy immediately established a presence off Africa to enforce the ban, called the West Africa Squadron. Although the ban initially applied only to British ships, Britain negotiated treaties with other countries to give the Royal Navy the right to intercept and search their ships for slaves. A notable exception was the United States, which refused such permission. The 1807 Act Prohibiting Importation of Slaves technically abolished the intercontinental slave trade in the United States but the ban was not widely enforced and many of the slave ships which escaped the blockade were destined for the southern United States.
Document 8: William Snelgrave: William Snelgrave was an English sea captain, slave trader, and ivory trader on the West African coast. He was captured by pirate captains La Bouche, Thomas Cocklyn, and Howell Davis along the coast of West Africa in 1719. He was originally attacked by Cocklyn's quartermaster for failing to surrender. He was beaten and shot in the arm, but his men cried out "For God's sake, don't kill our captain, for we were never with a better man." Snelgrave was then spared. Snelgrave wrote about his captivity with the pirates. He described how Davis claimed that "their reasons for going a pirating were to revenge themselves on base merchants and cruel commanders of ships." This probably explains why Snelgrave was spared, despite the fact that he intended to fight the pirates.
Document 9: The Heroic Slave: The Heroic Slave, a heartwarming Narrative of the Adventures of Madison Washington, in Pursuit of Liberty is a short piece of fiction written by notable abolitionist Frederick Douglass, at the time a fugitive slave based in Boston. When the Rochester Ladies' Anti Slavery Society asked Douglass for a short story to go in their collection, "Autographs for Freedom", Douglass responded with "The Heroic Slave". The novella, published in 1852 by John P. Jewett and Company, was Douglass' first and only published work of fiction (though he did publish several autobiographical narratives).
Document 10: Edward Colston: Edward Colston (2 November 1636 – 11 October 1721) was a Bristol-born English slave trader, merchant and Member of Parliament. Much of his wealth, although used often for philanthropic purposes, was acquired through the trade and exploitation of slaves. He endowed schools and almshouses and his name is commemorated in several Bristol landmarks, streets, three schools and the Colston bun.
Document 11: Joanna Vassa: Joanna Vassa (1795-1857) was the only surviving child of the former slave and anti-slavery campaigner Olaudah Equiano. Her grave has recently been rediscovered in Abney Park Cemetery, London, but little is known of her life.
Document 12: David Livingstone: His fame as an explorer and his obsession with discovering the sources of the Nile River was founded on the belief that if he could solve that age-old mystery, his fame would give him the influence to end the East African Arab-Swahili slave trade. "The Nile sources," he told a friend, "are valuable only as a means of opening my mouth with power among men. It is this power which I hope to remedy an immense evil." His subsequent exploration of the central African watershed was the culmination of the classic period of European geographical discovery and colonial penetration of Africa. At the same time, his missionary travels, "disappearance", and eventual death in Africaand subsequent glorification as a posthumous national hero in 1874led to the founding of several major central African Christian missionary initiatives carried forward in the era of the European "Scramble for Africa".
Document 13: Onesimus (Boston slave): Onesimus (late 1600s–1700s) was an African-born man held as a slave by Puritan minister Cotton Mather, who helped mitigate the impact of a smallpox outbreak in Boston by introducing Mather to the principle of inoculation. In a 2016 "Boston Magazine" survey, he was declared one of the "Best Bostonians of All Time".
Document 14: Prince Hall: Prince Hall (  17351738 1807) was an African American noted as an abolitionist for his leadership in the free black community in Boston and as the founder of Prince Hall Freemasonry. He lobbied for education rights for black children and was active in the back-to-Africa movement.
Document 15: Olaudah Equiano: Olaudah Equiano (c. 1745 – 31 March 1797), known in his lifetime as Gustavus Vassa ( ), was a prominent African in London, a freed slave who supported the British movement to end the slave trade. His autobiography, published in 1789, helped in the creation of the Slave Trade Act 1807 which ended the African trade for Britain and its colonies.
ground_truth: Olaudah Equiano