Moving north-east from Siena’s old town centre, past a road flanked by centuries-old plane trees, we reach the so-called Colle della Capriola where, next to the friary and with a magnificent scenic setting, stands the most important church outside the city walls: the Basilica dell’Osservanza. Saint Bernardino of the Franciscan Order of Friars Minor, most eminent preacher of the fourteenth . . .