Riksdag Riksdag The Riksdag ( or "Sveriges riksdag") is the national legislature and the supreme decision-making body of Sweden. Since 1971, the Riksdag has been a unicameral legislature with 349 members (), elected proportionally and serving, from 1994 onwards, on fixed four-year terms. The constitutional functions of the Riksdag are enumerated in the Instrument of Government (), and its internal workings are specified in greater detail in the Riksdag Act (). The seat of the Riksdag is at Parliament House (), on the island of Helgeandsholmen in the central parts of Stockholm. The Riksdag has its institutional roots in the feudal
Riksdag of the Estates provinces to the Russian Empire. Comprising much of present-day Finland, these became a Grand Duchy under the Emperor, but the political institutions were kept practically intact. The Finnish estates assembled in 1809 at Porvoo to confirm the change in their allegiance. This Diet of Finland followed the forms of the Swedish Riksdag, being the legislative body of the new autonomous region. However, during the reigns of Alexander I and Nicholas I it was not assembled and no new legislation was enacted. The diet was next assembled by tsar Alexander II in 1863, due to the need to modernize the laws.