The earliest surviving account of Enrico Dandolo's introduction of the Venetian grosso associates it with the outfitting of the
Fourth Crusade in 1202 and tradition makes the need to pay for the ships which transported the crusaders the cause of the grosso's introduction. Even though coinage of the grosso might have begun a few years earlier, the influx of silver used to pay for the crusaders' ships led to its first large scale mintage. The coin had 2.18 grams of 98.5% fine silver, the purest medieval metallurgy could make. It was initially called a
ducatus argenti since Venice was a duchy, but is more widely known as a grosso or , a Muslim term referring to the seated figure on its reverse. , 1328-1339 The designs for the grosso came from the doge's seal and the Byzantine aspron
trachy. The obverse shows the standing figures of the doge and Saint
Mark the Evangelist, the patron of Venice. On the right, Saint Mark holds the gospel, which is his usual attribute, and presents a
Gonfalone to the doge. The doge holds the "ducal promise" Enrico Dandolo was the first doge to swear this coronation oath. The legend names the doge on the left, with his title, DVX in the field. The legend on the right names the saint as S. M. VENETI, i.e. Saint Mark of Venice. The reverse shows Christ facing, sitting on a throne. The legend abbreviates his Greek name as IC XC. A beaded bordure on both sides of the coin prevented silver from being shaved from the edge of the coin, a practice called
clipping. As an additional security measure, Doge
Jacopo Tiepolo added distinctive marks, initially variations in the punctuation in the obverse legend and later small marks near Christ's feet on the reverse, which identified the mint master responsible for the issues. But, except for updating the name of the doge and the addition of the reverse legend, TIBI LAVS 3 GLORIA, by Doge
Michele Steno, there were no significant changes in the grosso for one hundred and fifty years. Indeed, around 1237 the doge's coronation oath included a promise that he would not change the coinage without authorization from the council. Change did come, however. Between 1340 and 1370, increases in the price of silver forced most of the doges to stop issuing grossi, and the others to issue only a few. When Doge
Andrea Contarini resumed production of grossi their weight began to fall and continued falling until
Cristoforo Moro struck the last Venetian grossi with a weight of 0.45 grams. ==Influence of the Venetian grosso==