No likeness on file
Diocletian of Osimo
martyr at Osimo
SaintFull write-upDate unknown
Feast: 16 May (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)
Born
—
unknown
Died
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unknown
Beatified
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not on record
Canonised
—
not on record
Who they were
At Osimo in the Marche, Saints Florentius and Diocletian, martyrs.
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
The Roman Martyrology remembers him on 16 May as one of two martyrs at Osimo in the Marche.
Sources
Checked against the sources listed on 22 September 2026. Corrections welcome.