The flag was designed by Arsène Heitz and Paul Lévy in 1955 for the CoE as its symbol, and the CoE urged it to be adopted by other organisations. In 1985 the EU, which was then the European Economic Community (EEC), adopted it as its own flag (having had no flag of its own before) at the initiative of the European Parliament. The flag is not mentioned in the EU's treaties, its incorporation being dropped along with the European Constitution, but it is formally adopted in law.
Despite it being the flag of two separate organisations, it is often more associated with the EU due to the EU's higher profile and heavy usage of the emblem. The flag has also been used to represent Europe in sporting events and as a pro-democracy banner outside the Union. It has partly inspired other flags, such as those of other European organisations and those of states where the EU has been heavily involved (such as Bosnia and Herzegovina and Kosovo).