Solidus

...a currency reform based upon a new gold piece, the aureus, struck at the rate of 60 to the pound of gold. The controls failed and the aureus vanished, to be succeeded by Constantine’s gold solidus. The latter piece, struck at the lighter weight of 72 to the gold pound, remained the standard for centuries. For whatever reason, in summary, Constantine’s policies proved extraordinarily...

...court hierarchy and an increasing reliance upon a mobile field army, to what was considered the detriment of frontier garrisons. The establishment by Constantine of a new gold coin, the solidus, which was to survive for centuries as the basic unit of Byzantine currency, could hardly have been achieved without the work of his predecessors in restoring political and military stability...

...and the language and outlook Greek. The concept of the divine right of kings, rulers who were defenders of the faith—as opposed to the king as divine himself—was evolved there. The gold solidus of Constantine retained its value and served as a monetary standard for more than a thousand years. As the centuries passed—the Christian empire lasted 1,130 years—Constantinople,...

Inspiring many features of these transient coinages, but outliving them all, stood the currency of the Byzantine Empire. It was based on the gold solidus ( ¹/₇₂ of a pound) of Constantine—the bezant of 4.5 grams (about 70 grains) maximum, which dominated so much of European trade to the 13th century. Until the 10th century, halves and thirds were also...

In order to reorganize finances and currency, Constantine minted two new coins: the silver miliarensis and, most importantly, the gold solidus, whose stability was to make it the Byzantine Empire’s basic currency. And by plundering Licinius’ treasury and despoiling the pagan temples, he was able to restore the finances of the state. Even so, he still had to create class taxes: the gleba...