| Robert | Alexander | An estate owner in Scotland. |
| Napoleon | Belland | The newspaper boy. |
| Colonel | Bingaman | Viley and Ten Broeck's friend. |
| Sanders | Bruce | A union army colonel. |
| Robert | Burbridge | Harry's former employee. |
| Nanny | Butler | One of Jarret's horses. |
| Alice | Carneal | One of Dr. Warfield's horses. |
| Marc | Chagall | A famous painter. |
| Cassius | Clay | Mary's father. A real estate mogul. |
| Henry | Clay | The greatest breeder in Kentucky. Cash's brother. |
| Mary Barr | Clay | Dr. Warfield's granddaughter. |
| Welsh | Cobs | One of Martha's horses. |
| Tom | Custler | The marine mammal biologist. |
| Jacques-Louis | David | The great classicist. De Pujol's professor. |
| Garret | Davis | One of the racehorses. |
| Anel | De Pujol | An art school owner. Julien's master. |
| Frederick | Douglas | An essayist. |
| Ethelburt | Dudley | A surgeon. Scott's regiment commander. |
| Grey | Eagle | One of the great horses. |
| Fashion | Eclipse | Martha's house. Royal Eclipse's half-sister. |
| Royal | Eclipse | A famous English racehorse. Cyrena's horse partner. |
| Millard | Filmore | The President. |
| Little | Flea | One of the horses Viley leased. |
| Jacques | Garmond | Ten Broeck's chief of staff. |
| Old | Gem | Gem's father. A widower. |
| Samuel | Gossin | The farm manager. |
| General | Grant | Cincinnati's owner. |
| Clem | Greenberg | One of Pollock's first champions. |
| Peggy | Guggenheim | An art collector. |
| Parson | Gunn | A school owner. |
| Abe | Hawkins | Arrow's jockey. |
| John | Hunt-Morgan | The leader of Morgan Raiders. |
| Martha | Jackson | An American art dealer and gallery owner. |
| William | Johnson | A barbershop owner. |
| Howard | Kelogg | Cyrena's husband. |
| Duncan | Kenner | A baron. Arrow's owner. |
| Lee | Krasner | Jackson's wife. |
| Beth | Lewis | The Warfield's housekeeper. Harry's 2nd wife. |
| Harry | Lewis | Jarret's father. A racehorse trainer. |
| Jarret | Lewis | The racehorse trainer's son. |
| Mr. | Lincoln | The current President. |
| Henri | Meichon | Lexington's jockey. |
| Mary | Mellon | Paul's 1st wife. |
| Paul | Mellon | A library owner. |
| Madame | Mentelle | Mary's teacher. |
| Catherine | Morgan | A researcher. Jess's visitor. |
| James | Mullen | An army photographer. |
| Theo | Northam | A writer/journalist. A PhD candidate in art history. |
| Jackson | Pollock | An American painter and major figure in abstract expressionist. |
| John | Porters | Harry's favorite jockey. |
| Mr. | Pryor | A horse trainer. |
| William | Quantrill | The guerilla captain. |
| Jeremy | Raines | The conservator. |
| Mill | Reef | One of Paul's racehorses. |
| John Singer | Sargent | A portrait painter. |
| Thomas | Scott | The man who studied horse anatomy. Dr. Warfield's painter. |
| Richard | Singleton | Marse's horse. |
| Louis | Smith | Dr. Warfield's colleague. |
| William | Stuart | Ten Broeck's friend. |
| Dan | Swigert | Mr. Alexander's farm manager. |
| Richard | Ten Broeck | A race course owner. |
| Justine | Treadwell | A writer from Washington Post. |
| Edward | Troye | The Swiss painter. |
| Willa | Viley | Harry's former employee. |
| Horace | Wallis | The guy from Affiliates. |
| Anne | Warfield | Mary Jane's sister. |
| Elisha | Warfield | Harry's boss. A horse lover and breeder. |
| Mary Jane | Warfield | Dr. Warfield's daughter. Cash Clay's wife. |
| Sallie | Waters | Louis Smith's racehorse. |
| Gilbert | Watson | Highlander's jockey. Lexington's new jockey. |
| Thomas Jefferson | Wells | Lecompte's owner. |
| Abe | | One of Pryor's assistants. |
| Abiona | | Theo's mother. |
| Annie | | Dr. Warfield's maid. |
| Annie | | Martha's housekeeper. |
| Arrow | | One of Boston's sons. Ten Broeck's horse. |
| Arts | | One of Paul's racehorses. |
| Barry | | Theo's father. |
| Ben | | Pryor's driver. |
| Boston | | The racehorsing champ. |
| Bunny | | Mary's friends. |
| Cato | | Gem's colleague. |
| Charles | | Colonel Johnson's horse trainer. |
| Charlie | | Annie's brother. |
| Cincinnati | | The great mount. |
| Clancy | | Theo's dog. |
| Cyrena | | A 3-time champion in the national hunt team. Martha's mother. |
| Daniel | | Theo's best friend. |
| Darley | | Dr. Warfield's prize horse. |
| Eohippus | | The dawn horse. |
| Eric | | Hank's owner. |
| Ester | | The Warfield's cook. |
| Eveline | | Jack's wife. |
| Finetta | | Sayers's wife. |
| Gem | | Jarret's new companion. |
| Glacier | | One of Dr. Warfield's horses. |
| Glencoe | | The great stallion. |
| Hakeem | | Theo's friend. |
| Hank | | Eric's dog. |
| Hark | | Well's horse trainer. |
| Henry (2) | | Pryor's headman. |
| Highlander | | A 4-year-old champion. One of Lexington's opponents. |
| Hofmann | | A painter. Martha's friend. |
| Ira | | Gem's colleague. |
| Jack | | Gem's uncle. |
| Jess | | The osteology prep lab
manager at a museum in Maryland. |
| John | | Lecompte's jockey. |
| Julien | | A painter. Thomas Scott's new companion. |
| Lecompte | | One of Boston's sons. Lexington's race opponent. |
| Letters | | One of Paul's racehorses. |
| Lior | | Theo's editor. |
| Lolu | | Cash's mistress. |
| Maisy | | Jess's assistant. |
| Makela | | A curator. |
| Marquis | | Cash's cavalry-trained horse. |
| May | | Mr. Alexander's laundress and seamstress. |
| Mike | | Theo's friend. |
| Milo | | Jess's dead dog. |
| Nebula | | One of Lexington's daughters. |
| Novice | | One of Lexington's daughters. |
| Onyx | | One of Dr. Warfield's horses. |
| Rex | | One of Dr. Warfield's horses. |
| Ryolite | | Cash's chief mount. |
| Sayers | | Viley's friend. A judge. |
| Timon | | One of the old roans. |
| Zack | | One of Pryor's assistants. |
