ducat

ドゥカート　—　Names of money

The gold coin issued by Venice and others. It passed widely in Mediterranean trade.

Ducat of Venice14th–15th century Venetian Ducat1400–1413 Gold ducatEstablished 1586

⚠ It gained trust by maintaining an unchanged standard over a long period. It is an example of how the single factor of "not changing" can be more effective than the size of the issuing state.