Belgium · 15th Century
Bois-Seigneur-Isaac
On May 28, 1405, at the chapel of Bois-Seigneur-Isaac in Walloon Brabant, Belgium, a chaplain named Father Henri was celebrating Mass when he experienced doubts about the Real Presence of Christ in the Eucharist. These doubts troubled him deeply as he approached the moment of consecration.
About this miracle
As Father Henri pronounced the words of consecration over the Host, it suddenly and miraculously began to bleed profusely. The Blood flowed from the Host onto the corporal (the square linen cloth on which the sacred vessels rest during Mass) in such quantity that the priest was overwhelmed with awe and emotion. The bleeding continued for several moments, thoroughly staining the white linen cloth with the Precious Blood.
Father Henri immediately reported the miracle to his superiors. The Bishop of Cambrai, Peter d'Ailly—a prominent theologian and later a cardinal—personally conducted a thorough two-year investigation of the event. Bishop d'Ailly interviewed witnesses, examined the blood-stained corporal, consulted with theologians, and evaluated the spiritual fruits of the miracle.
On June 16, 1410, Bishop d'Ailly granted an indulgence of 40 days to pilgrims who visited the chapel at Bois-Seigneur-Isaac. On May 3, 1413, after completing his investigation, he officially authorized the veneration of the blood-stained corporal as a sacred relic and established a solemn annual procession in honor of the miracle. The first procession took place in 1414 and continues to this day.
Pope Martin V gave further recognition to the miracle by approving the construction of a monastery at Bois-Seigneur-Isaac on January 13, 1424. The Augustinian Canons Regular were entrusted with guarding the miraculous corporal and promoting devotion to the Precious Blood of Christ.
The blood-stained corporal has been preserved for over 600 years and is still publicly venerated today. Every year on Trinity Sunday, a solemn procession carries the miraculous corporal through the streets, attended by thousands of pilgrims. Numerous popes over the centuries have granted indulgences to those who visit and venerate the relic. The sanctuary of Bois-Seigneur-Isaac remains one of Belgium's most important Eucharistic pilgrimage sites.