The monks thought that the city would have protected them from armies and invaders. However Siena wasn’t able to defend the Abbey and in less than a century the monastery was sacked and left in ruin. At the end of the 18th century the campanile and the roof of the church felt down. The inhabitants of the surrounding cities started to sack what was left for building material.
Finally during the 19th century the monastery was partly restored; however only the Abbey’s walls still stand.