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Censorship was an essential element of Portuguese national culture throughout the country's history up until the Carnation Revolution in 1974. From its earliest history Portugal was subject to laws limiting freedom of expression. This was mainly due to the influence of the Church since the time of Ferdinand I, who requested that Pope Gregory XI institute episcopal censorship. Later, the censorship would also apply to the publication of other written works. Portuguese citizens still remember the Estado Novo's censorship policy, institutionalizing strict control over the media, resorting to measures used previously against newspapers and systematic sequestering of books. In fact, every political regime was very careful with the legislation related to the area of press freedom—in most cases restricting it. In the five centuries of the history of Portuguese press, four were marked by censorship.[clarification needed]
Portuguese history was marked by many forms of intellectual persecution. Those who dared to freely express thoughts that were contrary to official discourse were frequently punished with prison or public death.