Luxembourg's Prime MinisterJean Claude Juncker (L) Foreign Minister Jean Asselborn sign the EU Constitution in the 'Orazi and Curiazi' hall at the Campidoglio, the political and religious centre of ancient Rome, today home of Rome's city hall, October 29, 2004. In the same hall the 'Treaty of Rome' was signed on March 25, 1957, that constituted the EU. EU leaders gathered in Rome on Friday to sign a historic new constitution, but the planned celebration of European unity has been transformed into a crisis meeting over the bloc's stalled executive.