Historical Events in Church Annals for June 21:
Birth of Bruno Egisheim, son of Count Hugh in Lorraine, who would grow up to become Pope Saint Leo IX, 152nd successor of Peter who entered Rome to be coronated as Pope barefoot out of humility. He would excommunicate Michael Cerularius, the man responsible for the lasting schism between the Greek Church and the Latin Church.
Death of Saint Aloysius Gonzaga, an early Jesuit pioneer who sought to teach the youth and minister to the dying victims of the plague which he also eventually caught and died after receiving the last rites from Saint Robert Bellarmine. He was canonized in 1726 by Pope Benedict XIII and later declared Patron Saint of Youth by Pope Pius IX.
Italian physicist Galileo is forced by the Court of Inquisition to reject his Copernican heliocentric views, which the Church would later allow when more facts revealed the astronomer was correct in his findings.