In the 13th century, the Venetians imported goods from the East and sold them at a profit north of the Alps. They paid for these goods with Byzantine gold , but when the Byzantine emperor
Michael VIII Palaiologos backed the revolt of the
Sicilian Vespers in 1282, he debased the . This was just one more in a series of
debasements of the , and the
Great Council of Venice responded with its own coin of pure gold in 1284. In 1252
Florence and
Genoa introduced the gold
florin and
genovino, respectively, both of 3.5 grams of 98.6% fine gold; the florin preceded the ducat as Western Europe's first standard gold coin. Venice modeled the size and weight of their ducat on the florin, with a slight increase in weight due to differences in the two cities′ weight systems. The Venetian ducat contained 3.545 grams of 99.47% fine gold, the highest purity medieval metallurgy could produce. Venetian ducat designs followed those of the
silver grossi, which were ultimately of Byzantine origin. The obverse shows the
Doge of Venice kneeling before
St. Mark, the patron saint of Venice. Saint Mark holds the gospel, which is his usual attribute, and presents a
gonfalone to the doge. The legend on the left identifies the saint as S M VENET, i.e. Saint Mark of Venice, and the legend on the right identifies the doge, with his title DVX in the field. On the reverse, Christ stands among a field of stars in an oval frame. The reverse legend is the same as on Roger II's ducats. Succeeding doges of Venice continued striking ducats, changing only their name on the obverse. The ducat had a variable price versus the silver
Venetian lira, reaching 6.2
lire or 124
soldi (shillings) by 1470. At that point a ducat worth 124 soldi emerged as a new silver-based unit of account for quoting salaries and costs. Continued depreciation in the silver currency during the 16th century, however, made the gold ducat worth more than 124 soldi. At this point, the currency ducat of 124 soldi had to be distinguished from the higher-valued gold ducat, and the latter was eventually called the
ducato de zecca, i.e. ducat of the mint, which was shortened to
zecchino and corrupted to
sequin.
Leonardo Loredan extended the coinage with a half ducat and subsequent doges added a quarter, and various multiples up to 105 ducats. All of these coins continued to use the designs and weight standards of the original 1284 ducat. Even after dates became a common feature of western coinage, Venice struck ducats without them until
Napoleon ended the Venetian Republic in 1797. ==Adoption, 14th century==