"The basilikon (Greek: βασιλικόν [νόμισμα], "imperial [coin]"), commonly also referred to as the doukaton (Greek: δουκάτον), was a widely circulated Byzantine silver coin of the first ...
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half of the 14th century. Its introduction marked the return to a wide-scale use of silver coinage in the Byzantine Empire, and presaged the total abandonment of the gold coins around the middle of the century." - (en.wikipedia.org 07.09.2020)