This book is just a fantasy. Hopefully, an enjoyable one. But, it was based off of part of Caesar's life. Many of the characters are just fictionalized versions of historical figures. Flavia, her family, and Liza are purely fictitious, however, Mark, Julian, their parents, Kaesar, his wife, and Cassius the Brute are based on historical figures. Most of them were like their historic counterparts to the death with the exception of one: Mark. I've included a little bit about the actual historic people below.
Caesar (Kaesar): Caesar really did lead an eight year long war against the people of Gaul (current France and Germany). He gave his daughter to his friend Pompey in marriage. He and Pompey became enemies and the death of Caesar's daughter didn't help. Pompey and Caesar fought; Caesar won. Caesar most famously died at the hands of Cassius, Brutus, and a few others.
Calpurnia (Cornelia Kaesar): Calpurnia doesn't factor into the story of Caesar all that much. But she did live and married Caesar. She was either his third or fourth wife depending on the source you read from.
Pompey (Pompey): Pompey married Caesar's daughter, Julia. They were married for five years because she died after only being married to him for five years. He had two sons, Gneaus and Sextus, and one daughter, Pompeia. Pompey was married a total of five times. His three kids were all from his third marriage to Mucia Tertia. Pompey fought beside Caesar in the Gallic Wars only to turn on him later. Pompey unsuccessfully fought Caesar and lost his life to followers of Caesar's in Egypt. (Caesar avenged his old friend by killing Pompey's killers.)
Julia (Julia): Caesar's daughter and the fourth wife of Pompey. Not much is known about her other than her death turned Pompey and Caesar against each other.
Gnaeus Pompeius II (Julian): The eldest son of Pompey. He probably helped his father against Caesar until Pompey's death. Gnaeus and his brother fought an unsuccessful war against Caesar which resulted in Gnaeus's untimely beheading. He was thirty years old when he died.
Cassius and Brutus (Cassius the Brute): Cassius and Brutus are probably best known for killing Caesar (along with several others' help) an event which resulted in Shakespeare's play Julius Caesar (which includes the line "Et tu Brute"). Cassius and Brutus both ran on their own swords in the following war against Mark Antony and Octavius.
Sextus Pompeius (Mark): Pompey's younger son doesn't come onto the scene until he and Gnaeus fought Caesar. Sextus, unlike Gnaeus, escaped with his life. He fled. He ended up getting married and the couple had a daughter (Pompeia, probably named after Sextus's older sister). Sextus became a pirate and terrorized the Roman seas until he was caught and executed, without a trial, at the age of thirty five. He outlived his brother by a decade.
