The term applied to the standard, full-weight gold denomination between 963 and 1092 to differentiate from the light-weight
gold denomination (nomisma tetarteron). During the reign of Michael IV (1034-1041), the coin began to take a slightly concave
shape, with the degree of curvature increasing over time. During the eleventh century, the coin went through various phases
of debasement, with the gold content plummeting in the 1080s.
Loading