Geraldine Brooks said about her historical fiction: “I try to get the factual details right so that when I make it up, I’ve laid the foundation strongly enough.”
As @ignatius pointed out above, she didn’t quite lay the foundation strongly enough for Thomas Scott’s side story about his affair with a young Black (male) artist. Scott’s marrying late in life was more likely the result of the intervening war, rather than his sexuality. Not that it really matters – which is basically my point. I am fine with taking poetic license with historical characters if it propels the story or explains a key plot point in some way. But the Scott embellishment didn’t seem necessary.
There is one other bit of historical poetic license that Brooks takes that does explain a key development, but is (I’m guessing) historical defamation of character. She throws John Pryor under the bus, suggesting that he is the cause of Lexington’s massive infection that led to his blindness. Under Pryor’s care, while Jarret is banished, Lexington breaks into the feed store, eats a bag of corn and develops terrible, potentially deadly colic. Pryor makes matters worse by bleeding the horse.
150 + years later, Catherine calls Jess with the results of the scan of Lexington’s skeleton:
“Craniofacial infection leading to malformation of the bone. That’s the official diagnosis. As you know, the bone over the sinus is very thin, so it’s easily distorted by disease. The scan shows the teeth interacting abnormally with the sinus complex. So, the hypothesis is that a dental infection caused the outbulging.”
“Poor horse,” said Jess.
“Indeed,” said Catherine. “Though it might’ve all started with a pleasant binge at the feed bins.”
“Huh?”
“Just a theory. The horse may have got loose and gorged himself. Food went where it shouldn’t have and caused an occult abscess in the lining of his sinus. Result: erosive osteomyelitis. It’s probably what caused the blindness—the infection damaged the optic nerve.”
Pryor comes off in the novel as careless and a bit cruel. But there is no reason to believe, historically speaking, that he was anything but a superb trainer.
His interesting aside:
John Benjamin Pryor, the famed Natchez trainer of Lexington at Fatherland Plantation, married Adam Bingaman’s mulatto daughter Frances Ann. Three sons followed their father’s profession and all were working as horse trainers in New Jersey by 1880. Historic Natchez Foundation
He moved to England for a time, mid-career – some accounts say that it may have been because there would have been less hostility there toward his marriage to a woman of mixed race.