The Estates in Sweden (including Finland) and later also Russia's Grand Duchy of Finland were the two higher estates, nobility and clergy, and the two lower estates, burghers and land-owning peasants. Each were free men, and had specific rights and responsibilities, and the right to send representatives to the Riksdag of the Estates. The Riksdag, and later the Diet of Finland was tetracameral: at the Riksdag, each Estate voted as a single body. Since early 18th century, a bill needed the approval of at least three Estates to pass, and constitutional amendments required the approval of all Estates. Prior to the 18th century, the King had the right to cast a deciding vote if the Estates were split evenly.