The Polish Constitutional Tribunal and the Central Archives of Historical Records, in cooperation with the Princes Czartoryskich Foundation, present a special exhibition European ideas in the legal-state traditions of the Polish-Lithuanian Commonwealth. It comprises of 45 documents on legal and political issues from the times of the Polish Crown and the Grand Duchy of Lithuania. There are two important reasons for such an event – an anniversary of The Third May Constitution and the Polish accession to the European Union.