Stranica sa despotovim grbom - Public domain dedication image

Page of Ulrich Richentals Armorial, dated 1415, from the Council of Constance and this print is from 1483.
[1]

The top two coats of arms are identified as those of of the (fictional) emperor Alexander of Athens at the time of Saint Paul.
The bottom left one is that of herzog dyspolt zu ratzen, i.e. the count of Rascia
The bottom right one is that of graff von anthoniss und herzog zu kriechen, a Greek prince