A more thorough explanation:

Definition: A ducat is a gold coin that was used as currency in Europe. It first appeared in Venice in the early 1100s and had the motto "sit tibi, Christe, dato, quem tu regis, iste Ducatus" which means "let this duchy which thou rulest be dedicated to thee, O Christ". The coin was used in several countries, including Austria and the Netherlands, and survived into the 20th century.

During the Renaissance period, ducats were commonly used to purchase goods and services. Merchants and traders would often carry ducats with them on their travels.

In the 19th century, the Austrian Empire issued ducats as a form of currency. These coins were made of gold and were highly valued.

These examples illustrate how ducats were used as a form of currency in different time periods and countries. They were highly valued and widely used for trade and commerce.