Death of Saint Helena, mother of the Emperor Constantine and founder of the True Cross of Christ.
Pope Saint Gelasius I decrees that his spiritual power as supreme pontiff is superior to the temporal power of the Emperor Anastasius. It was called the Gelasian Decree.
Death of Saint Theodosius Pechersky, Abbot and founder of Russian monasticism who died in the Caves of Kiev.
The Papal/Genoese fleet is captured by Imperial ships of Emperor Frederick and Pope Gregory IX, near death, is helpless to come to their aid.
The Fifth Lateran Council, known as the 18th Ecumenical Council, is convened by Pope Julius II in Rome with reforms on the agenda which would be rebuked by Martin Luther and others spawning the Protestant Reformation.
Pope Pius IX releases his 16th encyclical universally on priests and the care of souls called Amantissimi Redemptoris
Pope Pius XI ushered his 32nd encyclical Caritate Christi compulsi which was centered on the Sacred Heart of Jesus