The deadlines for the Jubilee celebration were set by Boniface VIII every 100 years. Following a petition from the Romans to Pope Clement VI (1342), the period was reduced to 50 years.
In 1389, in memory of the number of years of Christ’s life, it was Urban VI who fixed the Jubilee cycle for every 33 years, and for 1390 he instituted a Jubilee that was celebrated, however, following his death, by Boniface IX.
However, in 1400, at the end of the previously established fifty years, Boniface IX confirmed there would be forgiveness for pilgrims who had come to Rome.
Martin V celebrated a new Jubilee in 1425, opening the Holy Door in St John Lateran for the first time.
The last to celebrate a 50-year Jubilee was Pope Nicholas V in 1450. In fact, from Paul II the time between Jubilee was brought to 25 years, and in 1475 a new Holy Year was celebrated by Sixtus IV. Since then, ordinary Jubilees have taken place with constant frequency. Unfortunately, the Napoleonic Wars prevented the celebrations of the Jubilees of 1800 and 1850, resuming in 1875 after the annexation of Rome to the Kingdom of Italy.
More information, on the website www.iubilaeum2025.va
