http://25.media.tumblr.com/tumblr_m8uioawS4c1rvi754o1_r1_500.png
The coat of arms of the antipope Benedict XIII (reigned 1394-1423), who was elected to succeed the Avignon papacy and reigned in opposition to Pope Boniface IX.
The use of the tiara with pastoral cross is based off a contemporary depiction of Benedict’s coat of arms, as the use of tiara with keys was not yet the standard.
a modern version, with Papal regalia:
http://www.araldicavaticana.com/img44.jpg
and as Caridnal Pedro Martínez de Luna y Pérez de Gotor:
These old papal & anti-papal) arms are quite interesting.
It would be helpful for those of us who aren’t familiar with the history of the papacy to include dates so we can view them in a broader historical context without having to resort to Wiki 
.
Nice rendering.
