National Front (Spanish: Frente Nacional 1958–1974) was a period in the history of Colombia in which the two main political parties, the Liberal Party and the Conservative Party, agreed to rotate power, intercalating for a period of four presidential terms. The National Front Presidents were Alberto Lleras Camargo (Liberal), Guillermo León Valencia (Conservative), Carlos Lleras Restrepo (Liberal), and Misael Pastrana Borrero (Conservative).