The European Assizes was a one-time assembly of the European Parliament and the national parliaments of the member states of the European Union in Rome in 1990. It took place just before the governments of the Member States embarked on the negotiations that resulted in the Treaty of Maastricht. It was therefore the first time in history that the parliaments, which would eventually have to ratify a treaty, met in advance of the negotiations to discuss what should go into that treaty.