Coat of arms of the <a href="https://en.wikipedia.org/wiki/House_of_Schl%C3%BCsselberg" class="extiw" title="en:House of Schlüsselberg">Schlüsselberg family</a> above the entrance to the monastery church <a href="https://en.wikipedia.org/wiki/Frensdorf" class="extiw" title="en:Frensdorf">Schlüsselau</a>
<a href="//commons.wikimedia.org/wiki/User:Ermell" title="User:Ermell">Ermell</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>