Foundation stone is laid at a celebration overseen by Pope Julius II to begin construction of the new St. Peter's Basilica in Rome.
The Diet of Worms in which Holy Roman Emperor Charles V condemns Martin Luther a year after the latter had been excommunicated by Pope Leo X. Luther, a proud man, refuses to repent despite the severe action taken against him.
Pope John Paul II beatified on this day his fellow Pole Blessed Sister Maria Faustina Kowalska, the Apostle of Divine Mercy. She would be canonized seven years later on April 28th by the same Pontiff.
The Shroud of Turin goes on display in Turin, Italy. It would be available for pilgrims to visit through June 24th including the Holy Father on May 22nd. Over three million would pass through the turnstiles.
Pope John Paul II canonizes Saint John Calabria, Saint Agostina Livia Petrantoni and Saint Marcelino Champagnat. All three founded religious orders in the 19th and 20th centuries, the first two in Italy with the Congregations for the Poor Servants of Divine Mercy and the Sisters of Charity respectively, and St. Marcelino the Marist Brothers in helping resurrect the faith after the French Revolution.