The keystone comes from the former cross-vaulted St. Gall Abbey Library, which Abbot Diethelm Blarer had built in 1551-1553. It shows the coat of arms of one of the monks who lived in the monastery community at the time of construction.
<bdi>missing name
</bdi>
between 1551 and 1553 <div style="display: none;">date QS:P571,+1551-00-00T00:00:00Z/8,P1319,+1551-00-00T00:00:00Z/9,P1326,+1553-00-00T00:00:00Z/9</div>
<span class="int-own-work" lang="en">Own work</span>