I think that is a particularly appealing example of fourteenth century manuscript art, and in its use of the arms of the Kingdom.
St Stephen. as depicted by by János Rozsnyai in the Crucifixion (1445) on the north wall of the sanctuary of the cathedral of Nagyszeben, can be seen here:
To this I would add this picture:
Procession of the relics of St Stephen to the Parliament building in August 2000.
I will, hopefully, post more about the Holy Crown of St Stephen on August 20th.