Date set for Popes John Paul II and John XXIII sainthood
Pope John Paul II and Pope John XXIII will be declared saints on 27 April 2014, Pope Francis has announced.
The Pope said in July that he would canonise his two predecessors, after approving a second miracle attributed to John Paul.
Polish John Paul, the first non-Italian pope for more than 400 years, led the Catholic Church from 1978-2005.
Pope John was pontiff from 1958-1963, calling the Second Vatican Council that transformed the Church.
The decision to canonise the two at the same time appears designed to unify Catholics, correspondents say.
John Paul II is a favourite of conservative Catholics, while John XXIII is widely admired by the Church's progressive wing.'The good pope'
John Paul II's life and teachings have had an enormous impact in Poland, his homeland.
The number of young Polish men training to become priests rose by about a third after his election in 1978, peaking in the mid-1980s.
Polish Catholic Church leaders will be hoping his canonisation will have a similar effect.
The number of Polish seminarians - while still much higher than in the rest of Europe - has been declining steadily since his death in 2005.
John Paul stood out for his media-friendly, globetrotting style. He was a fierce critic of communism, and is credited with helping inspire opposition to communist rule in eastern Europe.
John Paul has been on a fast track to sainthood since his death, when crowds in St Peter's Square chanted "santo subito" ("sainthood now").
During his own papacy he simplified the process by which people are made saints, and created more of them than all previous popes combined.
John XXIII is remembered for introducing the vernacular to replace Latin in church masses and for creating warmer ties between the Catholic Church and the Jewish faith.
He has a big following in Italy, where he is known as Il Papa Buono, the good pope.
The BBC's David Willey reports from Rome that Pope John was in many ways similar to Pope Francis, a humble, down-to-earth man with a fine sense of humour.
Two living popes are expected to be present at the canonisation ceremony: Francis, who will officiate, and Pope Benedict, who retired earlier this year.
The double canonisation will be the first in the Church's history.
Two miracles have been officially attributed to Pope John Paul II - the number usually needed for canonisation.
The first miracle was the apparent curing of a 49-year-old French nun, Sister Marie Simon-Pierre Normand. She had been diagnosed with Parkinson's Disease, the same malady which afflicted the pope himself in his later years.
The second miracle came on the day of John Paul II's beatification by his successor, Pope Benedict XVI. A Costa Rican woman reportedly made an "inexplicable recovery" from a serious brain illness, and the only explanation was believed to be the fact that her family had prayed for John Paul II's intercession.
Pope John XXIII was beatified by John Paul II in 2000, and Pope Francis took the unusual step of waiving the requirement of a second miracle in his case.