In the very heart of the town is the ancient church of Santa Marta, opposite the parish church of Santi Nazaro e Celso on the other side of the square. The origins of the building are clearly revealed by its structure: erected as an oratory in the late middle ages, it was long the seat of the so-called Disciplini, a lay penitent confraternity particularly dedicated with Saints John the Baptist and John the Evangelist on either side. Also notable are the paintings of the same period located in the presbytery with episodes of the life of Saint Martha. On the left side of the nave, the chapel of the Holy Sepulchre features an unexpected late-fifteenth century Lombard masterpiece: an eight piece sculptural group in polychrome wood describing the scene of the reflection and meditation on Christ’s Passion and Crucifixion. The severe rules followed by the 74 members of the confraternity, compiled by Carlo Borromeo in the second half of the sixteenth century, gave great importance to penitence, even in the form of self-flagellation.