John XXIII (Angelo Giuseppe Roncalli) (1881-1963) was Pope from 1958 until his death.
Short Biography:
He improved relations with the USSR in line with his encyclical Pacem in Terris/Peace on Earth (1963), established Roman Catholic hierarchies in newly emergent states, and summoned the Second Vatican Council, which reformed church liturgy and backed the ecumenical movement.
Why is Pope John XXIII famous?
Pope John XXIII ruled Vatican City from 1958 until his death.
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