No likeness on file
John the Isaurian
monk on Aegina
SaintFull write-upDate unknown
Feast: 18 April (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
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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
Checked against the sources listed on 22 September 2026. Corrections welcome.