I can no longer edit the post, so i will comment here.
These are my civ icon proposals.
PS: Icon of a more credible source and accuracy is used.
Old icons are removed.
For this one i do not have .svg template to play with.
But this eagle design is the most accurate.
Serbian medieval state heraldry:
Divellion of Emperor Dusan.
Nemanjic dynasty coat of arms, monastery Hilandar, 1198.
Medieval Serbian ring, gold with niello details, possibly belonged to queen Theodora, wife of medieval Serbian king Stefan UroÅ” III DeÄanski, early 14th century, around 1322, found in her grave in Banjska monastery.
Medieval Serbian signet ring with engraved figure of Double-headed eagle and two Cyrillic letters, silver, 14th century, found in Serbia.
Serbian medieval coin:
Coat of arms of Nemanjic Dynasty (1166-1371) *Serbian Empire coat of arms.
Dynastic coat of arms of the Serbian Kingdom
Royal dynastic flag of Nemanjic (gold version), drawn 1339
Royal dynastic flag of Nemanjic (gold version), drawn 1380
Royal dynastic flag of Nemanjic (gold version), drawn 1439
Cheers!