The constitutional history of Spain dates back to the constitution of 1812. In June 1976, Spain's new King Juan Carlos dismissed Carlos Arias Navarro and appointed the reformer Adolfo Suárez as Prime Minister. The resulting general election in 1977 convened the ''Constituent Cortes'' (the Spanish Parliament, in its capacity as a constitutional assembly) for the purpose of drafting and approving the constitution of 1978. After a national referendum on 6 December 1978, 88% of voters approved of the new constitution – a culmination of the Spanish transition to democracy.