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.
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.
The Interesting Narrative of the Life of Olaudah Equiano
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.
Shadrach Minkins (c. 1814 – December 13, 1875) was an African-American fugitive slave from Virginia who escaped in 1850 and reached Boston.
 He is known for being freed from a courtroom in Boston after being captured by United States marshals under the Fugitive Slave Act of 1850.
 White and black members of the Boston Vigilance Committee freed and hid him, helping him get to Canada via the Underground Railroad.
 Minkins settled in Montreal, where he raised a family.
 Two men were prosecuted in Boston for helping free him, but they were acquitted by the jury.
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.
Cat Royal (also known as Cat Royal Adventures) is a series of 7 historical fiction adventure books by Julia Golding, a British novelist.
 The main character of the series is an orphan named Catherine "Cat" Royal.
 The series are set in 18th Century London where Cat lives in the Theatre Royal, Drury Lane, after she was abandoned on the front steps of the theatre and taken in by Richard Brinsley Sheridan, the owner of the theatre.
 The main themes are slavery and equality between people from all races and social classes.
 While the main cast of characters are fictional, some real historical figures, such as Olaudah Equiano, feature as supporting characters.
Middle Passage (1990) is a historical novel by Charles R. Johnson about the final voyage of an illegal American slave ship.
 Set in 1830, it presents a personal and historical perspective of the illegal slave trade in the United States, telling the story of Rutherford Calhoun, a freed slave who unknowingly boards a slave ship bound for Africa in order to escape a forced marriage.
John McDonogh (29 December 1779–26 October 1850) was a United States slave owner and to make up for his life of owning African peoples decided to repay the community for what he and others like him had taken, by providing grants for the public education of freed people of color and paying for one way tickets to Liberia.
 He also was part of the American Colonization Society, whom like other colonizationists wanted to send freed people of color back to Africa, even if those persons were born and raised in the United States, because colonizationists like Mcdonogh did not want them to integrate into United States society.
 He was described as miserly, controversial, and eccentric.
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.

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