During the last two Jubilees, which had taken place in 1450 and 1475, the enormous inflow of pilgrims had caused several traffic problems in the Borgo; because of that, in order to solve the problem, during the papal consistory of 16 November 1498 the pope gave the task to rationalize the paths which led to St. Peter, asking Cardinal Girolamo Riario to take the lead and consult experts.