Pope Alexander VI expanded the rite of the Jubilee year of 1500 by opening other doors in Saint Peter's Basilica, Basilica of Saint Mary Major and the Basilica of Saint Paul Outside the Walls. This jubilee year began on Christmas day and ended on the Feast of the Epiphany 1501. During the reign of Pope John VII the holy doors were opened every 33 years, reflecting the number of years attributed to the lifespan of Jesus Christ. This was later amended to 50 years in commemoration of the Hebrew custom of Jubilees and later changed to a centenary or at any time at the will of the reigning Pontiff.