During the 11th century,the nomisma(the gold coin)suffered a debasement,with the purity of the coinage falling from 24 carats to 8 carats.The debasement marked the end of ultra stability of the nomisma in more than seven centuries.In the Byzantine Empire,the nomisma was both a symbol of the imperial power and a tool for the emperor to maintain the centralised rule.The Byzantine emperors paid remunerations of the army and the bureaucrats with the nomisma mainly.Meanwhile,they forced the peasants to pay taxes in nomisma.As the taxation system was gradually monetised,the apparatus of the state was effectively functioning with the link of the nomisma.The debasement of the nomisma in the 11th century had a huge and profound impact on the political,economic,and military affairs of the Byzantine Empire,and led to the collapse of the taxation system and caused a military crisis.During this process,the Roga which was based on gold coins drew to a close.Afterwards,the payments of the remunerations changed,which led to the separatism.The history of the Byzantine Empire entered into a stage of aristocratic rivalry and the empire declined gradually.Therefore,the debasement issue of the nomisma provides a new perspective on the decline of the Byzantine Empire in the 11th century.
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