Four commemorative coins have been issued jointly:
Source: European Central Bank and Wikipedia
- in March 2007, to commemorate the 50th anniversary of the Treaty of Rome
- in January 2009, to celebrate the 10th anniversary of Economic and Monetary Union
- in January 2012, to commemorate ten years of euro banknotes and coins
- in August 2015, to celebrate the 30th anniversary of the EU flag
As a rule, euro countries may each issue only two €2 commemorative coins per year. Exceptionally, they are allowed to issue a third, provided that it is one issued jointly and that it commemorates events of Europe-wide importance.
These coins use a common design on the national side, showing the name of the issuing country as well as the event commemorated in the respective languages.