His house still stands and can be seen in the ruins of the city of Pompeii which remain after being partially destroyed by the eruption of Vesuvius in AD 79.

The house is known both for its frescoes and for the trove of wax tablets discovered there in 1875, which gave scholars access to the records of Iucundus's banking operations.

Freedmen and slaves performed many small business tasks for Iucundus, such as signing receipts as witnesses and collecting payments from clients.

The freedmen Phoebus, Communis and Chryseros are named in his records as acting for him, as are the slaves Philadelphus, Menippus and Dionysus.

[2] A further freedman named Felix has been suggested as the dedicator of the portrait herm of Iucundus found in the atrium of the house.

[3] Many names of elite Pompeian citizens occur frequently in his transaction records, suggesting that Iucundus also had dealings with the upper class of his town.

In fact, he even travelled to nearby Nuceria to help the wealthy Praetorian Guard senior centurion Publius Alfenus Varus resell some slaves that he had purchased in an auction.

[7] He is believed to have had offices either in the macellum or in his house, and to have worked alongside around six associates, including a freedman of the Helvii family named Apollonaris.

[2] The tablets that Iucundus left behind suggest that he died in the earthquake on 5 February 62, since his records stop a few days before that date.

[17] The tablets include a reference to the freedman Marcus Venerius Secundio, whose tomb in the Porta Sarno necropolis was excavated in 2021.

[18] In total, the names of around 115 people (excluding those acting as witnesses) are known from the tablets, of which fourteen — all sellers in auctions — belong to women.

Seal of Quintus Appuleius Severus, Marcus Lucretius Lerus, Tiberius Julius Abascantius, M. Julius Crescens, M. Terentius Primus, M. Epidius Hymenaeus, Q. Granius Lesbus, Titus Vesonius Le…., D. Volcius Thallus.In this inscription, Iucundus included the date and the list of witnesses, which were listed in descending order of social status.

"[25] Another, which probably postdates Iucundus's death, proclaims his son Quintus' support for Ceius Secundus, a candidate for the office of duumvir.

[30] In the Cambridge Latin Course, Caecilius has a wife, Metella; a daughter, Lucia; and a son, Quintus, on whom books two and three in the series are based.

[32] In a 2008 episode of British television science-fiction series Doctor Who entitled "The Fires of Pompeii", Peter Capaldi portrays Lobus Caecilius, a marble merchant based on Iucundus.