Riksdag of the Estates (formally: Swedish: Riksens ständer; informally: Swedish: Ståndsriksdagen) was the name used for the Estates of Sweden when they were assembled. Until its dissolution in 1866, the institution was the highest authority in Sweden next to the king. It was a Diet made up of the Four Estates, which historically were the lines of division in Swedish society:
The meeting at Arboga in 1435 is usually considered to be the first Riksdag, but there is no indication that the fourth estate, the peasants, had been represented there.
The States or the Estates (French: États, German: Landstände, Dutch: Staten) signifies the assembly of the representatives of the estates of the realm, the divisions of society in feudal times, called together for purposes of deliberation, legislation or taxation. In German-speaking countries they were also known by the name Landtag (see also Diet).
In many states, the first estate comprised the clergymen, the second estate the nobility, and the third estate the commoners (bourgeoisie, artisans and peasants). The actual representation of these three estates in the assembly could vary from country to country. Bourgeoisie, peasants and people with no estate from birth were separated in Sweden and Finland as late as in 1905.