Trienio Liberal
After the Peninsular War, the pro-independence traditionalists and liberals clashed in the Carlist Wars, as King Ferdinand VII ("the Desired One"; later "the Traitor King") revoked all the changes made by the independent Cortes Generales in Cádiz, the Constitution of 1812 on 4 May 1814. Military officers forced Ferdinand to accept the Cádiz Constitution again in 1820, and was in effect until April 1823, during what is known as the Trienio Liberal.