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John the Isaurian
monk on Aegina
SaintResearchedDate unknown
Feast: 18 April (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)
Born
—
unknown
Died
—
unknown
Beatified
—
not on record
Canonised
—
not on record
Who they were
In the same place, Saint John the Isaurian, monk, who was a disciple of Saint Gregory the Decapolite and strove strenuously under the emperor Leo the Armenian in defence of the sacred images.
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 18 April as a monk on Aegina, a disciple of Saint Gregory the Decapolite, who strove in defence of the sacred images under the emperor Leo the Armenian.
Sources
- Roman Martyrology, 18 April (Italian Bishops' Conference, Santo del giorno)
- Wikidata Re85e539c — dates, feast day and identifiers (CC0)
Checked against the sources listed on 22 September 2026. Corrections welcome.