The solidus was maintained essentially unaltered in weight, dimensions and purity, until the 10th century. During the 6th and 7th centuries "lightweight" solidi of 20, 22 or 23 "siliquae" (one "siliqua" was 1/24 of a solidus) were struck along with the standard weight issues, presumably for trade purposes or to pay tribute. Many of these lightweight coins have been found in Europe, Russia and Georgia. The lightweight solidi were distinguished by different markings on the coin, usually in the for the 20 and 22 "siliquae" coins, and by stars in the field for the 23 "siliquae" coins. Until the reign of Constantine VI the coins continued to feature Latin text, being finally replaced with Greek script in the early years of the ninth century.