Armoiries du pape Grégoire XIII : the Boncompagni family coat of arms,  di rosso al drago d'oro spiegato, reciso e sanguinante
drago d'oro spiegato e reciso: "a dragon, displayed and cut in half", showing the head and wings, but no feet and no tail. 
biblelight.net - gregory.jpg
4.bp.blogspot.com - Stemma+Boncompagni.jpg
romeartlover.tripod.com
romeartlover.tripod.com
romeartlover.tripod.com
Own work
Figures utilisée :  
Source du blasonnement : http://www.araldicavaticana.com/pgregorio13.htm
Odejea