When in Rome in Italy

When in Rome or during a Rome shore excursion and when visiting Rome with your sons or family, your driver Rome tour guide should tell you showing you Saint Peter Basilica that the first Holy Year of the history of Rome and the Christian religion was planned and organized in 1300, the 22th of January, by Pope Bonifacius VIII.
The real text of this celebration is now incastonated in a stone of the hall of Saint Peter Basilica.
According to the tradition, the Holy Year has its beginning on 25th of December, when the Pope asks to enter in the Basilica through the Holy Door, and finishes the next year on 24th of December when the Pope closes the Holy Door.
The same ceremony happens some days later in the other three biggest Rome Basilicas (St John in Lateran, St Mary the Major and St Paul outside the Walls).