Question: Which slave's story inspired the novel that beings the "trilogy" that, according to Toni Morrison, Paradise completes?

Beloved is a 1987 novel by the American writer Toni Morrison.  In the novel, the protagonist Sethe is also a slave who escapes slavery, running to Cincinnati, Ohio.  After 28 days of freedom, a posse arrives to retrieve her and her children under the Fugitive Slave Act of 1850, which gave slave owners the right to pursue slaves across state borders.  Sethe kills her two-year-old daughter rather than allow her to be recaptured and taken back to Sweet Home, the Kentucky plantation from which Sethe recently fled.  A woman presumed to be her daughter, called Beloved, returns years later to haunt Sethe's home at 124 Bluestone Road, Cincinnati, Ohio.  The story opens with an introduction to the ghost: "124 was spiteful.  Full of a baby's venom."  Set after the American Civil War (1861–65), it is inspired by the story of an African-American slave, Margaret Garner, who escaped slavery in Kentucky late January 1856 by fleeing to Ohio, a free state. <SEP> The iron bit, also referred to as a gag, was used by slave masters and overseers as a form of punishment on slaves in the Southern United States.  The bit, sometimes depicted as the scold's bridle, uses similar mechanics to that of the common horse bit.  The scolds bridle however, is almost always associated with its use on women in the early 17th century and there are very few accounts of the device as a method of torture against black slaves under that particular name.  As opposed to the whip, the iron bit lacks the historic, social, and literary symbolic fame that would make information on the use of the iron bit as accessible.  Its use throughout history has warranted some attention though, mostly from literary texts.  Most notable is Toni Morrison’s novel "Beloved", which gives insight as to the emotional and mental trauma of being subjected to the bit.  Even earlier, slave narratives and publications of newspapers and magazines from the 18th century on give evidence of this device being used to torture and punish slaves. <SEP>  According to the author, it completes a "trilogy" that begins with "Beloved" and includes "Jazz". Paradise is a 1997 novel by Toni Morrison, and her first novel since winning the Nobel Prize in Literature in 1993. <SEP> The Bluest Eye was written by Toni Morrison in 1970.  Morrison, a single mother of two sons, wrote the novel while she taught at Howard University.  She centered the story around a young African American girl named Pecola who grows up during the years following the Great Depression in Lorain, Ohio.  Because of her dark skin color, Pecola gets taunted for her appearance as the members of her community associate beauty with "whiteness".  She ultimately develops an inferiority complex, which fuels her desire for blue eyes.  The point of view switches between the perspective of Claudia MacTeer, the daughter of Pecola's foster parents, and multiple third-person limited viewpoints.  Due to the controversial issues the book raises such as racism, incest, and child molestation, there have been numerous attempts to ban it from schools and libraries.