Saint Sossius or Sosius (Italian: Sosso, Sossio or Sosio; 275 – 305 AD) was Deacon of Misenum, an important naval base of the Roman Empire in the Bay of Naples.

[1] The legend conserved in the Atti Bolognesi states that during the Diocletian persecutions, Januarius, bishop of Benevento, escaped from his see and traveled to Pozzuoli "incognito."

Legend says Januarius, with whom he studied to become a priest, predicted the martyrdom of Sossius when he saw a luminous red light and a dove hover over his head while he read the gospel at mass.

Januarius, Festus, and Desiderius, on hearing of Sossius’ arrest, took a risk and visited him in prison at the sulphur mines of Pozzuoli, near the volcano of Solfatara.

The authorities discovered that these men were also Christians and they were thrown to the wild beasts as well, but as one modern account states, "...when the animals came near the Saints, they fell affectionately at their feet and refused to harm them.".