The Conventionsthaler was a standard silver coin of the Holy Roman Empire. It was introduced in 1754 and contained one tenth of a Cologne mark of silver or about 23.39 grams. Its most famous example is the Maria Theresa thaler which is minted until today.
The Conventionsthaler succeeds the Reichsthaler (containing 25.98 g fine silver) as the standard coin in most of the Holy Roman Empire, with a variety of subdivisions being used:
- 1 Conventionsthaler = 2 Austro-Hungarian Gulden, each gulden equal to 20 groschen or 60 kreuzer.
- 1 Conventionsthaler = 2.4 South German Gulden, each also containing 60 kreuzer.
- 1 Conventionsthaler = 11⁄3 North German thaler of accounts, each of 24 groschen.
During the early 19th century, the Conventionsthaler of 11⁄3 thaler (17.54 g fine silver per thaler) was superseded in Northern Germany by the Prussian thaler containing 1/14th of a Cologne mark or 16.70 g fine silver, while the Conventionsthaler of 2.4 South German gulden (9.73 g fine silver per gulden) was superseded by 2.7-gulden Kronenthalers containing 9.52 g fine silver per gulden. See Kronenthaler.