Constituent Cortes
The Constituent Cortes is the description of Spain's parliament, the Cortes, when convened as a constituent assembly.
In the 20th century, only one Constituent Cortes was officially opened, and that was the Second [Spanish Republic|Republican] Cortes in 1931. It drafted a new Spanish [Constitution of 1931|constitution] but its work was overturned by the victory of the Nationalist [faction (Spanish Civil War)|Nationalists] in the Spanish Civil War.
The Cortes in 1977 enacted a new Spanish constitution which it had drafted. It was never officially considered "constituent", as the assembly chosen in the 1977 general elections was not mandated at the time to create a new constitution, but to rule under the constitution of the former dictatorship - the so-called Leyes Fundamentales.