The European Union (EU) is a supranational political and economic union of 27 member states that are located primarily in Europe. Ref: https://en.wikipedia.org/wiki/European_Union
Find out more about the events and treaties which have shaped the roles of the European Council, the Council of the EU, the Eurogroup and the Euro Summit.
Check out the new History web page under the European Council Website. Ref: https://www.consilium.europa.eu/en/history/