Belgium, 2 euro coin 2021, to commemorate the 500 Years of Carolus V Coins. In 1521, Charles V introduced a golden guilder of 20 stuivers, a new unit of account: the Carolus guilder. In 1543, a silver Carolus guilder was also introduced. After the abdication of Charles V, the coins were no longer minted. However, the (Carolus) guilder remained in use in the Low Countries for a long time as a term and unit of account.