Answer:
The history of the flag goes back to 1955. The Council of Europe - which defends human rights and promotes European culture – chose the present design for its own use. In the years that followed, it encouraged the emerging European institutions to adopt the same flag.
In 1983, the European Parliament decided that the Communities’ flag should be that used by the Council of Europe. In 1985, it was adopted by all EU leaders as the official emblem of the European Communities, later to become the European Union. In addition, all European institutions now have their own emblems.