Fig. 367.—Arms of Herr von Frouberg. "Gules, a mare rampant argent, bridled sable."
<bdi><a href="https://en.wikipedia.org/wiki/en:Arthur_Charles_Fox-Davies" class="extiw" title="w:en:Arthur Charles Fox-Davies"><span title="British writer (1871-1928)">Arthur Charles Fox-Davies</span></a>
</bdi>
1909
A Complete Guide to Heraldry.