This intriguing church is part of a still-operating monastery. The church dates back to the 10th century but was altered on several occasions, notably in the 15th century, when Giorgio di Challant of the ruling family ordered the original frescoes to be painted over and a new, lower roof installed.
All was not lost: the renovations left the upper levels of the frescoes intact above the new roofline. You can ask the warden to unlock the door, letting you clamber up a narrow flight of wooden steps into the cavity between the original and the 15th-century ceilings to view the well-preserved remnants.