Andronicus II Reforms
During Andronicus II's reign he instituted a some new coinage based on the hyperpyron. They were the silver miliaresion or basilika at 12 to the hyperpyron and the billon politika at 96 per hyperpyron along with the copper assaria, tournesia and follara The basilikon was a copy of the Venetian ducat and circulated since 1304 for fifty years.
The hyperpyron remained in regular issue and circulation until the 1350s, remaining in use thereafter only as a money of account. After 1400, Byzantine coinage became insignificant, as Italian money became the predominant circulating coinage.
These scyphate (cup-shaped) coins known as trachy were issued in both electrum (debased gold) and billon (debased silver). The exact reason for such coins is not known, although it is usually theorized that they were shaped for easier stacking.
Read more about this topic: Byzantine Coinage
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“Nothing divine dies. All good is eternally reproductive. The beauty of nature reforms itself in the mind, and not for barren contemplation, but for new creation.”
—Ralph Waldo Emerson (1803–1882)