Who were knights Becella? And what would their flag doing in Hilandar?
He was used as logo? Sorry I dont get you?
You want to say he didnt use it as his personal banner? Could be. In monastery Hilandar there are two flags held to belong to Tsar Dušan or his units.

Anyway in Middle Ages all flags were military flags, except Church ones. Flags were worn during battles, royal entries, parades etc or they were put on castles and fortified towns. There was no concpet of flag as represent of nation.



That's what I'm talking about. In a Christian temples are preserved objects of interest and among them certainly are, and military flags.

In Chilandar are not the flag of Emperor. These flags are, at best, a flag of some units of his army.

Of course, the flag of the Middle Ages were not representing the nation.