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Laserian z Leighlin

SaintFull write-upPre-congregation

Feast: 18 April (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)

Born
—
unknown
Died
639
verified
Beatified
—
not needed: before formal processes
Canonised
By tradition
recognised before formal processes began

Who they were

Laserian (Laisren, Molaisse) is said to have spent years at Iona and to have been ordained in Rome by Pope St Gregory the Great. At Leighlin, on the Barrow, where St Goban had founded a monastery, he led the side favouring the Roman date of Easter at a synod nearby.

Sent to Rome to settle the matter, he was consecrated bishop by Pope Honorius and made papal legate for Ireland, and he seems largely to have ended the Easter dispute in the south. He later ruled the monastery at Leighlin until his death in 639. Butler warns that the early accounts disagree.

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

A seventh-century bishop of Leighlin who helped settle the Easter question in southern Ireland.

Sources

Checked against the sources listed on 22 September 2026. Corrections welcome.

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