Lebuin (Old English Liafwin, 'beloved friend') was an Anglo-Saxon priest, probably Northumbrian, who joined the Anglo-Saxon mission to the Frisians under St. Gregory of Utrecht (Boniface's successor) around 754.
Sent to evangelize the still-pagan continental Saxons of the IJssel valley (modern eastern Netherlands), he founded around 770 the foundational mission station at Deventer — building the first Catholic chapel on the IJssel river, the foundational origin of the modern Dutch city of Deventer and its Catholic cathedral.
He is most famous in continental hagiography for his prophetic appearance, alone and unarmed, at the great Saxon pan-tribal assembly at Marklo (Marklohe on the Weser, in modern Lower Saxony) around 772 — where he confronted the assembled Saxon dukes and free men, prophesying that if they did not accept the Catholic faith they would be conquered by a foreign king and forced to it.
The prophecy was fulfilled twelve years after his death by Charlemagne's brutal Saxon Wars (772–804) — the foundational forced-conversion of the Saxons, which is among the morally most fraught chapters of medieval Catholic missionary history. Lebuin himself died peacefully at Deventer on November 12, 775, having returned to find his chapel destroyed by the Saxons and rebuilt it; his body was buried at the foundational Deventer site, where his shrine remained the principal pilgrim destination of the IJssel valley throughout the medieval centuries.

