Version of the <a href="https://en.wikipedia.org/wiki/Shield_of_the_Trinity" class="extiw" title="en:Shield of the Trinity">Shield of the Trinity</a> diagram as a church decoration.  The text in the outer circle (which reads in Latin "Blessed is the Holy and Undivided Trinity") is not technically part of the diagram.
<a href="//commons.wikimedia.org/wiki/User:Rabanus_Flavus" title="User:Rabanus Flavus">Rabanus Flavus</a>
2017-06-06
<span class="int-own-work" lang="en">Own work</span>