Castus of Rome
Feast: 1 July (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)
Who they were
Casto and Secondino are venerated as bishop-martyrs of the 3rd century, though nothing reliable is known of their history and even the 'Acts' that identify them as bishops are considered largely legendary. Tradition places their martyrdom at the ancient city of Sinuessa, though some scholars suggest their devotion may have been imported from Africa and taken root among the local faithful.
Their veneration later moved to what is now Mondragone, whose importance as the site of a royal castle of the Kings of Naples helped their veneration spread to nearby towns; it survives today at Sessa Aurunca, Gaeta, Calvi, Capua, Sora, Trivento and Benevento, and Casto and Secondino remain patrons of Mondragone. Their feast is kept on 1 July.
The miracles
There was never a formal cause: he has been honoured as a saint since before the Church's formal processes began.
Why that counted as sanctity
Bishop-martyr venerated since antiquity at Sinuessa and later Mondragone; feast 1 July.
Connected on this site
- Casto and Secondino Saint honoured together
- Casto and Secondino Saint“Casto and Secondino are venerated as bishop-martyrs of the 3rd century, though nothing reliable is known of their history and even the 'Acts' that identify them as bishops are considered largely legendary.” — this site's research
- Santi, beati e testimoni (santiebeati.it) - Santi Casto e Secondino, by Franco Dieghi
- Wikidata Q105488832 — dates, feast day and identifiers (CC0)
Checked against the sources listed on 22 September 2026. Corrections welcome.