Death of Pope Nicholas III, 180th successor of Peter, who was the first Pope to actually reside permanently at the Vatican. It was Nicholas who actually laid out the famous gardens. He also sent missionaries to convert the Tartar kings.
The Last White Rose: Death of the Catholic Plantagenet King Richard III at the Field of Bosworth. It is significant to the Church because it not only ended the War of the Roses, but enabled the Tudor line to take hold through the victory of King Henry VII who sired a son. And we all know the story of his son Henry VIII!
The Catholic convert Hiacoomes is ordained, thus becoming the first Native-American Indian priest. Exactly three centuries later within a week in the same month another Native-American would be ordained and go on to make great strides on the American Catholic scene: Archbishop Charles Chaput of Denver.
Pope Leo XIII issues his 20th encyclical Quod multum on the liberty of the Church, specifically in Hungary.