This article is part of the series: Politics and government of Iceland
The Alþing, commonly Anglicized as Althing (Modern Icelandic Alþingi; Old Norse Alþing) is the national parliament: literally, the "all-thing" of Iceland. It was founded in 930 at Þingvellir, (the "assembly fields" or "Parliament Plains"), situated some 45 km east of what would later become the country's capital, Reykjavík, and this event marked the beginning of the Icelandic Commonwealth. Even after Iceland's union with Norway, the Althing still held its sessions at Þingvellir until 1799, when it was discontinued for some decades. It was restored in 1844 and moved to Reykjavík, where it has resided ever since. The present parliament building, the Alþingishús, was built in 1881, of hewn Icelandic stone.
The constitution of Iceland provides for six electoral constituencies with the possibility of an increase to seven. The constituency boundaries are fixed by legislation. Each constituency elects nine members. In addition, each party is allocated seats based on its proportion of the overall national vote in order that the number of members in parliament for each political party should be more or less proportional to its overall electoral support. A party must have won at least five percent of the national vote in order to be eligible for these proportionally distributed seats. Political participation in Iceland is very high: usually over 85 per cent of the electorate casts a ballot (87.7% in 2003). The current president of the Althing is Sturla Böðvarsson.

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      The Althing is the oldest parliamentary institution in the world. Its establishment, as an outdoor assembly held on the plains of Þingvellir from about the year 930 AD, laid the foundation for an independent national existence in Iceland. To begin with, Althing was a general assembly of the Icelandic Commonwealth, where the country's most powerful Leaders (goðar) met to decide on legislation and dispense justice. Then, all free men could attend the assemblies, which were usually the main social event of the year and drew large crowds of farmers and their families, parties involved in legal disputes, traders, craftsmen, storytellers and travellers. Those attending the assembly dwelt in temporary camps (búðir) during the session. The center of the gathering was the Lögberg, or Law Rock, a rocky outcrop on which the Lawspeaker (lögsögumaður) took his seat as the presiding official of the assembly. His responsibilities included reciting aloud the laws in effect at the time. It was his duty to proclaim the procedural law of Althing to those attending the assembly each year.
      
      Foundation
      Public addresses on matters of importance were delivered at the Law Rock and there the assembly was called to order and dissolved. The Lögrétta, the legislative section of the assembly, was its most powerful institution. It comprised the 39 district goðar plus nine additional members and the Lawspeaker. As the legislative section of Althing, the Lögrétta took a stand on legal conflicts, adopted new laws and granted exemptions to existing laws. Althing of old also performed a judicial function and heard legal disputes in addition to the spring assemblies held in each district. After the country had been divided into four quarters around 965 AD, a court of 36 judges (fjórðungsdómur) was established for each of them at Althing. Another court (fimmtardómur) was established early in the 11th century. It served as a supreme court of sorts, and assumed the function of hearing cases left unsettled by the other courts. It comprised 48 judges appointed by the goðar of Lögrétta.
      
      Lögrétta
      When the Icelanders submitted to the authority of the Norwegian king by the terms of the "Old Covenant" (Gamli sáttmáli) in 1262, the function of Althing changed. The organization of the commonwealth came to an end and the rule of the country by goðar disappeared. Executive power now rested with the king and his officials, the Royal Commissioners (hirðstjórar) and District Commissioners (sýslumenn). As before, the Lögrétta, now comprising 36 members, continued to be its principal institution and shared formal legislative power with the king. Laws adopted by the Lögrétta were subject to royal assent and, conversely, if the king initiated legislation, Althing had to give its consent. The Lawspeaker was replaced by two legal administrators, called lögmenn.
      Towards the end of the 14th century, royal succession brought both Norway and Iceland under the control of the Danish monarchy. With the introduction of absolute monarchy in Denmark, the Icelanders relinquished their autonomy to the crown, including the right to initiate and consent to legislation. After that, the Althing served almost exclusively as a court of law until the year 1800.
      
      Monarchy until 1800
      The Althing was disbanded by royal decree in 1800. A new High Court, established by this same decree and located in Reykjavík, took over the functions of Lögrétta. The three appointed judges first convened in Hólavallarskóli on 10 August 1801. The High Court was to hold regular sessions and function as the court of highest instance in the country. It operated until 1920, when the Supreme Court of Iceland was established.
      
      High Court: 1800 – 1845
      A royal decree providing for the establishment of a new Althing was issued on 8 March 1843. Elections were held the following year and the assembly finally met on 1 July 1845. It comprised 26 members sitting in a single chamber. One member was elected in each of 20 electoral districts and six "royally nominated Members" were appointed by the king. Suffrage was, following the Danish model, limited to males of substantial means and at least 25 years of age, which to begin with meant only about 5% of the population. A regular session lasted four weeks and could be extended if necessary. During this period, Althing acted merely as a consultative body for the crown. It examined proposed legislation and individual members could raise questions for discussion. Draft legislation submitted by the government was given two readings, an introductory one and a final one. Proposals which were adopted were called petitions. The new Althing managed to effect a number of improvements to legislation and the administration of the country.
      
      Consultative assembly: 1845 – 1874
      The Constitution of 1874 granted to the Althing joint legislative power with the crown in matters of exclusive Icelandic concern. At the same time the National Treasury acquired powers of taxation and financial allocation. The king retained the right to veto legislation and often, on the advice of his ministers, refused to consent to legislation adopted by Althing. The number of members of Althing was increased to 36, 30 of them elected in general elections in eight single-member constituencies and 11 double-member constituencies, the other six appointed by the crown as before. The Althing was now divided into an upper and a lower chamber. Six elected members and the six appointed ones sat in the upper chamber, which meant that the latter could prevent legislation from being passed by acting as a bloc. Twenty-four elected representatives sat in the lower chamber. From 1874 until 1915 ad hoc committees were appointed. After 1915 seven standing committees were elected by each of the chambers. Regular sessions of Althing convened every other year. A supplementary session was first held in 1886, and these became more frequent after the turn of the 20th century. The Althing met from 1881 in the newly built Parliament House. The Governor-General (landshöfðingi) was the highest representative of the government in Iceland and was responsible to the Advisor for Iceland (Íslandsráðgjafi) in Copenhagen.
      
      Legislative assembly from 1874
      A constitutional amendment, confirmed on 3 October 1903, granted the Icelanders home rule and parliamentary government. An Icelandic minister was appointed on 1 February 1904 who was answerable to parliament. The minister had to have the support of the majority of members of Althing; in the case of a vote of no confidence, he would have to step down. Under the constitutional amendment of 1903, the number of members was increased by four, to a total of forty. Elections to the Althing had traditionally been public – voters declared aloud which of the candidates they supported. In 1908 the secret ballot was adopted, with ballot papers on which the names of the candidates were printed. A single election day for the entire country was at the same time made mandatory. When the Constitution was amended in 1915, the royally nominated members of Althing were replaced by six national representatives elected by proportional representation for the entire country.
      
      Home rule
      The Act of Union which took effect on 1 December 1918 made Iceland a state in personal union with the king of Denmark. It was set to expire in 25 years, after which either state could choose to leave the union. The Althing was granted unrestricted legislative power. In 1920 the number of members of the Althing was increased to 42. Since 1945, the Althing has customarily assembled in the autumn. With the Constitutional Act of 1934 the number of members was increased by seven and the system of national representatives abolished in favor of one providing for eleven seats used to equalize discrepancies between the parties' popular vote and the number of seats they received in the Althing, upping the number of members of the Althing to 49. In 1934, the voting age was also lowered to 21. Further changes in 1942 provided for additional three members and introduced proportional representation in the double-member constituencies. The constituencies were then 28 in number, 21 single-member constituencies, six double-Member constituencies and Reykjavík, which elected eight members. With the additional eleven equalization seats, the number of members was thus 52.
      
      Personal union
      When Denmark was occupied by Germany on 9 April 1940 the union with Iceland was effectively severed. On the following day, the Althing passed two resolutions, investing the Icelandic cabinet with the power of Head of State and declaring that Iceland would accept full responsibility for both foreign affairs and coastal surveillance. A year later the Althing adopted a law creating the position of Regent to represent the crown. This position continued until the Act of Union was repealed, and the Republic of Iceland established, at a session of the Althing held at Þingvellir on 17 June 1944.
      In 1959 the system of electoral districts was changed completely. The country was divided into eight constituencies with proportional representation in each, in addition to the previous eleven equalization seats. The total number of members elected was 60. In 1968, the Althing approved the lowering of voting age to 20 years. A further amendment to the Constitution in 1984 increased the number of members to 63 and reduced voting age to 18 years. By a constitutional amendment of June 1999, implemented in May 2003, the constituency system was changed. The number of constituencies was cut from eight to six; constituency boundaries are to be fixed by law. Major changes were introduced in the Althing itself in May 1991 and the assembly now sits as a unicameral legislature. There are currently twelve standing committees.