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Paula
See Cartilia
Phrixus
Gaius Plinius Phrixus is a former slave of Pliny the Elder. He was later set free by Gaius Plinius Secundinus and often helps the four friends if they are staying near Laurentum.
Pliny
Pliny the Elder is an admiral and famous writer. Flavia meets him in The Secrets of Vesuvius and impresses him with her knowledge of his writings. He later dies as a result of the eruption of Vesuvius.
Pliny the Younger
Pliny the Younger, Pliny's nephew, is a wealthy young lawyer who becomes a friend of Flavia and the others. He first appears in The Secrets of Vesuvius. He helps Gaius when his farm is destroyed, becoming his patron. In The Slave-girl from Jerusalem Flavia asks him for his legal help, which he is glad to give until unnerved by hearing that the great Quintilian will be appearing for the prosecution.
Pistor
Pistor the baker runs the famous bakery in Ostia and is father to Porcius. he appears in a Roman Mysteries short story called The Code of Romulus when Flavia tries to solve the mystery of who is stealing his famous poppy seed rolls. He and his family also make an appearance at Miriam's funeral.
Porcius
Born in AD 69 to a family of bakers, Porcius is the first of the children of Ostia to be captured by the slave-traders led by Magnus. Porcius is rescued by the four friends in The Colossus of Rhodes. He also appeared as a guest in Nubia's birthday party.
Porcius is an ecstatic fan of chariot racing and knows almost as much as there is to know about the sport. He even races his pet mice in a miniature arena.
When Porcius is first mentioned in The Code of Romulus, he is apparently rather fat. By the end of The Colossus of Rhodes, however, he has grown thin and scrawny after being starved by the slave traders. His girth appears to have returned in The Charioteer of Delphi.
Polla
Polla Argentaria is the beautiful wife of Publius Pollius Felix. She suffers from depression and tries to poison herself when she finds out that Felix has fathered many illegitimate slave children.
Pulchra
Polla Felicia Pulchra first appears in The Pirates of Pompeii and is the eldest daughter of the wealthy Roman patron Publius Pollius Felix. When we first meet her she is shown in a bad light as a pampered, snobbish "daddy's girl". Pulchra is of similar age with Flavia being the elder of two months, Jonathan and Nubia, and is described as slim with beautiful golden hair (which she tosses arrogantly when she wants to brag) and wide blue eyes. She is also very pretty, hence her nickname, which means "beautiful" in Latin. According to "The Roman Mysteries Treasury" she was born on the 31 July AD 68, making her slightly older than Nubia.
Pulchra is the daughter of Publius Pollius Felix and his beautiful wife, Polla, who is suffering from post-natal depression when we first meet her. She has two younger sisters named Pollina and Pollinilla. She also has her own personal slave girl named Leda and she treats her with utmost cruelty; beating her frequently and locking her in a wooden chest when she "misbehaves". She is shown as a bit of a snob and looking down on Nubia, since Nubia is still Flavia's slave during this point in the book, and does not even bother to directly talk to her. Despite her stuck-up beliefs, she begins to fall in love with Jonathan from the moment they meet and even gives him a priceless ruby ring from her jewellery box even though they have only known each other ten minutes. Pulchra devotes herself to Jonathan and ignores Flavia, deliberately mispronouncing her name as "Fulvia" and mistaking Lupus for Jonathan's slave. She also starts to sort of influence Flavia and then Flavia starts to treat Nubia with a little less respect, which Jonathan points out to her. Flavia and Lupus look on Pulchra as a "spoilt little harpy", but do not think her truly wicked until Pulchra whips Nubia and snaps her precious flute in half, which causes her to run away. Flavia and Pulchra fight violently in the valley overlooking Pulchra's villa and are kidnapped by slave dealers. The two girls make up and Flavia tells Pulchra how much Nubia means to her. Pulchra is then shown in a better light as a lonely girl with no friends as she tells Flavia how lucky she is to have friends. She also has a poor relationship with her family, as her father spends no time with her and her mother is ill. She has no interest in her two sisters, and treats them almost as badly as she treats Leda.
At first Pulchra is displayed as spoiled, cruel and selfish, and also a bit of a snob. She certainly has no sense of humanitarianism as she tells Jonathan that Nubia cannot own a puppy as she is a slave: "Slaves can't own property, they are property." Though later on she is shown as lonely and miserable. The four detectives are the only friends she ever had.
In the television series, Pulchra is played by Millie Binks. Like her father she really existed a poem by a man named Statius attets to this
Read more about this topic: List Of The Roman Mysteries Characters