Quintus Caecilius Iucundus was the son of Lucius Caecilius Iucundus, a banker who lived in the Roman town of Pompeii around AD 14–62. A relatively obscure historical figure, Quintus Caecilius Iucundus is most notable as a major character in the Cambridge Latin Course, set in the Ancient Roman Empire. In the series, he is primarily known as 'Quintus'; his father is known as 'Caecilius' and his mother as 'Metella'. On the death of Caecilius in the AD 79 eruption of Vesuvius, Quintus becomes the protagonist of books two and three, and returns briefly in book five. Quintus in the Cambridge Latin Course In the first volume of the Cambridge Latin Course, the reader finds Quintus as a teenager in Pompeii, in AD 78, the year before it is destroyed by Mount Vesuvius. As Caecilius is dying, he sends his slave Clemens to find Quintus, and give him the rights to Caecilius' property and fortune. The family dog, Cerberus, dies in the final story. In the second volume, the reader finds Quintus in Roman Britain, living in the house of a distant relative named Salvius, based on the historical Gaius Salvius Liberalis. They experience several adventures together and with other inhabitants of Britain, including Cogidubnus (known as 'Togidubnus' in the 5th edition), the client king of the Cantiaci. Most of Book Two consists of Quintus' retelling of his past to Cogidubnus, particularly his time in Alexandria, in Roman Egypt, where Quintus freed his slave Clemens and befriended Barbillus, a wealthy Roman. When Barbillus died, he tasks Quintus to find his estranged son and heir, Rufus, in Britain. In the third volume, Quintus and Salvius become enemies, as Salvius plots to kill Cogidubnus. Salvius accuses Quintus of treason, but Quintus attempts to foil the murder by informing the Roman governor, Agricola, of Salvius treachery. Along the way, Quintus finds Rufus, who turns out to be a loyal ally, and gives him the letter from Barbillus. In Book Four, the plot moves to Rome. Quintus is not present, and he does not appear again until the last stories of the fifth volume, when Salvius goes on trial. Quintus provides crucial testimony which reveals Salvius' crimes and leads, at least apparently, to the latter's political downfall. Historical figure Little is known of the historical Quintus Caecilius Iucundus. His paternal grandfather, Felix, had been a freedman of the gens Caecilia and a banker in Pompeii.