World money of the 1st Millennium ad
The Golden solid appeared in circulation during the reign of the first Byzantine Emperor Constantine the Great (306-337 ad), replacing the Roman Golden aureus. Minted solid on the foot of 72 coins from the Roman pound weighing 24 carats - it turned out 4.5 grams of 900-proof gold.
The Byzantine coinage differed from the ancient Roman one in some features.
images of emperors on coins are more likely to resemble not a portrait of a specific person, but a sketch of his image – a kind of icon, when writing which did not strive to exactly match the original.
the emperors of Byzantium were usually depicted not in profile, but in full face.
Before 602 ad, the rulers of Byzantium were minted on coins without a beard, after 602, the emperors, starting with Phocas, had a beard.