The coins got their name from the circular inscription on the reverse: 'GROSSI PRAGENSES'. Initially, the silver sample in them was quite high-930. They could afford it, because not far from Prague, in Kunta Gora, at the end of the XIII century, very decent deposits of silver ore were discovered.
Promoting the centralization of the state and strengthening its power, Wenceslaus II introduced a state monopoly on the use of silver in payment transactions. Thus, all the mints were moved closer to Prague and merged into the Central mint, which claimed to be the leading economic centers of Moravia, Silesia, and Kladsk. This puts an end to the claims of local separate princes to the role of hegemon in the Czech state.