The Diet of Hungary or originally: Parlamentum Publicum / Parlamentum Generale^[1] (Hungarian: Országgyűlés) was the most important political assembly in Hungary since the 12th century, which emerged to the position of the supreme legislative institution in the Kingdom of Hungary from the 1290s,^[2] and in its successor states, Royal Hungary and the Habsburg kingdom of Hungary throughout the early modern period until the end of World War II. It was mainly held in big cities, traditionally in Pozsony (currently Bratislava), one of the most important Hungarian cities. The name of the legislative body was originally "Parlamentum" during the Middle Ages, the "Diet" expression gained mostly in the early modern period.^[3] It convened at regular intervals with interruptions from the 12th century to 1918, and again until 1946.

This article is missing information about the Diet between 1918 and 1946. (March 2024)

The articles of the 1790 diet set out that the diet should meet at least once every 3 years, but, since the diet was called by the Habsburg monarchy, this promise was not kept on several occasions thereafter. As a result of the Austro-Hungarian Compromise, it was reconstituted in 1867.

The Latin term Natio Hungarica ("Hungarian nation") was used to designate the elite which had participation in the medieval and early modern era political life of Hungary (at local level as members of the assemblies of the counties, or nation-wide level as members of the Parliaments). The members of the parliament consisted the envoys of the Roman Catholic clergy, the elected envoys of the nobility from the county assemblies of the Kingdom, and the envoys of cities who were elected by the people of the Royal Free Cities^[4][5] regardless of mother tongue or ethnicity of the person.^[6] Natio Hungarica was a geographic, institutional and juridico-political category.^[7]

Some researchers have traced the roots of the Hungarian institution of national assemblies as far back as the 11th century. This based on documentary evidence that, on certain "important occasions" under the reigns of King Ladislaus I and King Coloman "the Learned", assemblies were held on a national scale where both ecclesiastic and secular dignitaries made appearances.^[8] The first exact written mention of the word "parlamentum" (parliament) for the nationwide assembly originated during the reign of King Andrew II in the Golden Bull of 1222, which reaffirmed the rights of the smaller nobles of the old and new classes of royal servants (servientes regis) against both the crown and the magnates, and to defend the rights of the whole nation against the crown by restricting the powers of the latter in certain fields and legalizing refusal to obey its unlawful/unconstitutional commands (the "ius resistendi"). The lesser nobles also began to present Andrew with grievances, a practice that evolved into the institution of the Hungarian Diet.

An institutionalized Hungarian parliament emerged during the 14th and 15th centuries. Beginning under King Charles I, continuing under subsequent kings through into the reign of King Matthias I, the Diet was essentially convened by the king. However, under the rule of the two heavy handed kings like Louis the Great and during reign of the early absolutist Matthias Corvinus, the parliaments were often convened to announce the royal decisions, what the members of the parliament had to vote for [to meet the formal constitutional requirements], thus it had no significant power of its own. However since the reign of the Jagiellonian dynasty, the parliament has regained most of its traditional power.

In 1492 the Diet limited all serfs' freedom of movement and greatly expanded their obligations while at the same time only a few peasant families were prospering because of increased cattle exports to the West. Rural discontent boiled over in 1514 when well-armed peasants preparing for a crusade against Turks rose up under György Dózsa. Shocked by the peasant revolt, the Diet of 1514 passed laws that condemned the serfs to eternal bondage and increased their work obligations still further.

When King Vladislaus II died in 1516, a royal council appointed by the Diet ruled the country in the name of his ten-year-old son, King Louis II (1516–26).

In 1608 the Diet divided into two houses: House of Magnates and House of Representatives. From next Diet in 1609, the members of the House of Representatives elected by nobles of the Counties, by civics of the free royal cities and by members of the cathedral chapters.^[9]

Until 1848, the Diets were called Hungarian Diet of the Estates (Hungarian: Rendi országgyűlés) which was an Estates General

From the 13th century onwards, law-making was a joint right of the king and the diet. This remained a fundamental principle of the constitution of the later society of estate. After the extinction of the House of Árpád, the king was in many cases elected by the Diet, which guaranteed the Szabad Királyválasztás Joga (right of electing the king).

Before the development of the society of estate, the Diet consisted of the lords and the leaders of the church, but then the voting base was extended to the common nobility and the elected representatives of Royal free cities. By the 16th century the social classes that made up the 4 estates were the nobility, the common nobility, the clergy and the burghers.

From the 1400s onwards, two chambers began to be steadily separated, the lower plate of the estates and the arch-noblety on the upper. With the parliamentary system, the upper chamber was given over to the high priests and arch-nobles, while the lower chamber was filled by elected representatives. The Era of Reforms in 1848 brought an end to the Diet of the Estates, introducing the National Assembly. One of the key words of the Revolution of '48 was the taking away the privileges of the nobles and oligarchs, so currently there is an Unicamaral system, to guarantee the rule of the people. Until 1848, cathedral chapters were also members of the lower house, with 1-2 envoys.

In the course of the Hungarian Revolution of 1848 a diet was called at Pest that was dismissed by decree of Emperor Ferdinand I of Austria in October; the next year a Hungarian assembly met at the Protestant Great Church of Debrecen, which declared the new Emperor Franz Joseph deposed and elected Lajos Kossuth regent-president. The revolution was finally suppressed by Austrian troops under General Julius Jacob von Haynau and the assembly dissolved.

The Habsburgs again approached the Hungarian estates after the disastrous defeat at the 1859 Battle of Solferino and the loss of Lombardy. In 1860 Emperor Franz Joseph issued the October Diploma, which provided a national Reichsrat assembly formed by delegates deputed by the Landtage diets of the Austrian crown lands, followed by the February Patent of 1861, promising the implementation of a bicameral legislature. The Hungarian magnates however rejected being governed from Vienna and insisted on a parliamentary assembly with comprehensive autonomy in Hungarian affairs. The negotiations failed, predominantly due to the tough stance of Austrian Minister-President Anton von Schmerling.

Finally in the course of the Austro-Hungarian Compromise of 1867, the emperor appointed Gyula Andrássy Hungarian minister-president and the re-established national assembly convened on 27 February.

The legislative power was vested in this parliament, consisting of two houses: an upper house titled the Főrendiház ([føːrɛndihaːz], House of Magnates), and a lower house titled the Képviselőház ([ˈkeːpviʃɛløːhaːz], House of Representatives). From 1902 on parliament assembled in the Hungarian Parliament Building on the Danube in Budapest.

• Imperial Council (Austria)
• Diet of Dalmatia
• Indigenat (Hungary)

Free English language book about the history of parliamentarism in Hungary (Content: 22 pages, PDF format, link to the book: )