Alexius I Reforms
By the time of the Emperor Romanos Diogenis (1067–1071) the solidus had been debased to only roughly 15% gold content. Under Alexius I Comnenus (1081–1118) the debased solidus was discontinued and a gold coinage of higher fineness (generally .900-.950) was established, commonly called the hyperpyron at 4.45 grs.
The hyperpyron was slightly smaller than the solidus. It was introduced along with the electrum aspron trachy worth a third of a hyperpyron and about 25% gold and 75% silver, the billon aspron trachy or stamenon valued at 48 to the hyperpyron and with 7% silver wash and the copper tetarteron and noummion worth 18 and 36 to the billon aspron trachy.
Read more about this topic: Byzantine Coinage
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“We shall one day learn to supersede politics by education. What we call our root-and-branch reforms of slavery, war, gambling, intemperance, is only medicating the symptoms. We must begin higher up, namely, in Education.”
—Ralph Waldo Emerson (1803–1882)