Toni Morrison—who was born on February 18, 1931—made a name for herself with The Bluest Eye, Sula and Song of Solomon, but it wasn’t until 1987’s Beloved, about a runaway slave haunted by the death of her infant daughter, that her legacy was secured. The book won the Pulitzer Prize and was a key factor in the decision to award Morrison the Nobel Prize in 1993. All the awards aside, Beloved is a testament to the horrors of slavery, with its narrative of suffering and repressed memory and its dedication to the more than 60 million who died in bondage. Here are some notable facts about Morrison’s process and the novel’s legacy.

1. IT’S BASED ON A TRUE STORY.

While compiling research for 1974's The Black Book, Morrison came across the story of Margaret Garner, a runaway slave from Kentucky who escaped with her husband and four children to Ohio in 1856. A posse caught up with Garner, who killed her youngest daughter and attempted to do the same to her other children rather than let them return to bondage. Once apprehended, her trial transfixed the nation. "She was very calm; she said, 'I’d do it again,'" Morrison told The Paris Review. "That was more than enough to fire my imagination."

2. MORRISON CAME UP WITH THE CHARACTER BELOVED AFTER SHE STARTED WRITING.

The book was originally going to be about the haunting of Sethe by her infant daughter, who she killed (just as Garner did) rather than allow her to return to slavery. A third of the way through writing, though, Morrison realized she needed a flesh-and-blood character who could judge Sethe’s decision. She needed the daughter to come back to life in another form (some interpret it as a grief-driven case of mistaken identity). As she told the National Endowment for the Arts’ NEA Magazine: "I thought the only person who was legitimate, who could decide whether [the killing] was a good thing or not, was the dead girl."

3. SHE WROTE THE ENDING EARLY IN THE WRITING PROCESS.

Morrison has said she likes to know the ending of her books early on, and to write them down once she does. With Beloved, she wrote the ending about a quarter of the way in. "You are forced into having a certain kind of language that will keep the reader asking questions," she told author Carolyn Denard in Toni Morrison: Conversations.

4. MORRISON BECAME FASCINATED WITH SMALL HISTORICAL DETAILS.

To help readers understand the particulars of slavery, Morrison carefully researched historical documents and artifacts. One particular item she became fascinated with: the "bit" that masters would put in slaves' mouths as punishment. She couldn’t find much in the way of pictures or descriptions, but she found enough to imagine the shame slaves would feel. In Beloved, Paul D. tells Sethe that a rooster smiled at him while he wore the bit, indicating that he felt lower than a barnyard animal.

5. SHE ONLY RECENTLY READ THE BOOK HERSELF.

In an appearance on The Colbert Report last year, Morrison said she finally got around to reading Beloved after almost 30 years. Her verdict: "It’s really good!"

6. THE BOOK INSPIRED READERS TO BUILD BENCHES.

When accepting an award from the Unitarian Universalist Association in 1988, Morrison observed that there is no suitable memorial to slavery, "no small bench by the road." Inspired by this line, the Toni Morrison Society started the Bench by the Road Project to remedy the issue. Since 2006, the project has placed 15 benches in locations significant to the history of slavery and the Civil Rights movement, including Sullivan’s Island, South Carolina, which served as the point of entry for 40% of slaves brought to America.

7. WHEN BELOVED DIDN’T WIN THE NATIONAL BOOK AWARD IN 1987, FELLOW WRITERS PROTESTED.

After the snub, 48 African-American writers, including Maya Angelou, John Edgar Wideman and Henry Louis Gates, Jr., signed a letter that appeared in the New York Times Book Review. "For all of America, for all of American letters," the letter addressing Morrison read, "you have advanced the moral and artistic standards by which we must measure the daring and the love of our national imagination and our collective intelligence as a people."

8. IT’S ONE OF THE MOST FREQUENTLY CHALLENGED BOOKS.

Between 2000 and 2009, Beloved ranked 26th on the American Library Association’s list of most banned/challenged books. A recent challenge in Fairfax County, Virginia, cited the novel as too intense for teenage readers, while another challenge in Michigan said the book was, incredibly, overly simplistic and pornographic. Thankfully, both challenges were denied.

9. MORRISON ALSO WROTE AN OPERA BASED ON GARNER’S LIFE.

Ten years ago, Morrison collaborated with Grammy-winning composer Richard Danielpour on Margaret Garner, an opera about the real-life inspiration behind Beloved. It opened in Detroit in 2005, and played in Charlotte, Chicago, Philadelphia and New York before closing in 2008.

10. MORRISON DID NOT WANT IT MADE INTO A MOVIE.

Although she publicly claims otherwise, according to a New York magazine story, Morrison told friends she didn’t want Beloved made into a movie. And she didn’t want Oprah Winfrey (who bought the film rights in 1988) to be in it. Nevertheless, the film came out in 1998 and was a total flop.

11. THERE'S AN ILLUSTRATED VERSION.

The Folio Society, a London-based company that creates fancy special editions of classic books, released the first-ever illustrated Beloved in 2015. Artist Joe Morse had to be personally approved by Morrison for the project. Check out a few of his hauntingly beautiful illustrations here.

This article originally appeared in 2015.