In 1263, a German priest, Fr. Peter of Prague, stopped at Bolsena while on a pilgrimage to Rome.
He celebrated Mass in the Basilica of Bolsena. When the moment of consecration arrived, the Host was transformed into Flesh!
This miracle strengthened the wavering belief of the priest in the Real Presence of Christ in the Eucharist.
The Sacred Body was inspected by Urban Pope IV and by St. Thomas Aquinas.
This miracle helped convince the Pope to extend the feast of Corpus Christi to the universal Church, so that everyone could recognize the love God has for those who love and worship Him.