This description is about the death of Pope John XXIII, who was the head of the Catholic Church from 1958 to 1963. He was known for his progressive reforms and for his openness to the modern world. On June 3, 1963, Pope John XXIII died at the age of 81.
From Wikipedia
Pope John XXIII was head of the Catholic Church and sovereign of Vatican City from 28 October 1958 until his death on 3 June 1963.