Pope John Paul II was sent to hospital for 55 days after contracting an infection.
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Mother Teresa was declared a saint by Pope Francis during a ceremony at the Vatican.
Pope Innocent III brought together the council for the Fourth Council of the Lateran, which was held at the Lateran Palace in Rome, Italy.
Joseph Ratzinger is inaugurated as Pope Benedict XVI.
Pope Gregory XII was appointed head of the Catholic Church by a conclave of 15 cardinals in Rome.
Pope Leo II became the bishop of Rome.
