Assertion: lightweight gold coin | /r/Synonym | the tetarteron nomisma
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text: In the 10th century Emperor Nicephorus II Phocas (963–969) introduced a new lightweight gold coin called the tetarteron nomisma that circulated alongside the solidus, and from that time the solidus (nomisma) became known as the ἱστάμενον νόμισμα (histamenon nomisma), in the Greek speaking world.