1) Gold coin 
==Establishment== Ever since Emperor Constantine I (r. 306–337) introduced it in 309, the Byzantine Empire`s main coinage had been the high-quality solidus or nomisma, which had remained standard in weight (4.55 grams) and gold content (24 carats) through the centuries. The Byzantine emperor Nikephoros II Phokas (r. 963–969), however, introdu....