The word solidus means solid, hard.
So these coins were hard money.
In Italy, one of the words we use for money is "soldi", after the solidus.
I have a few of these coins.
They are gorgeous and the analog attempt to Bitcoin.
842 Sats; In 842 AD the Byzantine Emperor Theophilos died in January — succeeded by his 2 year old son and mother Theodora as Regent. The gold solidus was introduced in the 4th century by Constantinople and retained its weight and purity for 7 centuries.

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