In 1654–1655 tsar Alexis I tried to carry out a monetary reform and ordered to mint silver one ruble coins from imported joachimsthalers and new kopek coins from copper (old silver kopeks was left in circulation). Although around 1 million of such rubles was made, its lower weight (28–32 grams) against the nominal ruble (48 g) led to counterfeiting, speculation and inflation, and after the Copper Riot of 1662 the new monetary system was abandoned in favour of the old one.