Prague groschen
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The Prague groschen (German: Prager Groschen, Latin: grossi pragenses, Czech: pražský groš, Polish: grosz praski) was a groschen-type silver coin that became very common throughout the Medieval Central Europe.
Minting of this coin started around 1300 after silver mines had been discovered in Kuttenberg during the reign of the Bohemian king Wenceslaus II. As Bohemia and Prague were part of the Holy Roman Empire, and German language the main language in the Empire, it became the most popular of the early groschen-type coins.
In documents of the era, e.g. the Peace of Thorn (1411), large amounts of money often were given in more convenient Latin: sexagena of Prague groschen, which equals to German: das Schock = 5 dozen = 1/2 small gross = 60.