Overview: Constitutionalism was endorsed in Portugal by D. João VI, in 1822, almost a hundred years before the implantation of the Republic. Along the way, the country experienced very tumultuous times, which culminated in the Civil War (1828-1834), led by the two sons of D. João VI: D. Pedro, the liberal, and D. Miguel, the absolutist. Following the victory of D. Pedro, the already uninhabited Monastery of São Bento da Saúde, a colossus by the architect Baltazar Álvares, is chosen to settle there (1834) the two chambers of those who, at the time, represented the Portuguese. Since the 1974 revolution, the Assembly of the Republic has finally become the body of universal representation for the Portuguese people. Knowing the spaces and works of art of the so-called São Bento Palace is to know part of the History of Portugal. A guided tour by the historian Cátia Mourão and the ex-parliamentarian Guilherme de Oliveira Martins.