The main difference between French conservatives and liberals following the Congress of Vienna was that the liberals believe in absolute monarchs.
The Congress of Vienna (German: Wiener Kongress) was a conference of ambassadors of European states chaired by Austrian statesman Klemens Wenzel von Metternich, and held in Vienna from November 1814 to June 1815, though the delegates had arrived and were already negotiating by late September 1814.